Question 1

A rectangular coil (0.20 m x 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T.If the orientation of the coil is varied through all possible positions,the maximum torque on the coil by magnetic forces is 0.080 N*m.What is the current in the coil?

Accepted Answer

A)  5.0 mA
B)  1.7 A
C)  8.3 mA
D)  1.0 AE) C) and D)
F) None of the above

Question 2

If a proton is released at the equator and falls toward the Earth under the influence of gravity,the magnetic force on the proton will be toward the:

Accepted Answer

A)  north.
B)  south.
C)  east.
D)  west.E) A) and D)
F) A) and C)

Question 3

A beam of electrons is sent in the positive x-direction in a region with a uniform magnetic field B in the positive y-direction and a uniform electric field E in the positive z-direction.At which of the following speeds would the electrons be deflected in the positive z-direction?

Accepted Answer

A)  v 
B)  v = E/B
C)  v > E/B
D)  There is no speed for which this will happen.E) All of the above
F) A) and C)

Question 4

An electron which moves with a speed of 3.0 x 104 m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (e = 1.6 x 10-19 C)

Accepted Answer

A)  4.8 x 10-14 N
B)  1.9 x 10-15 N
C)  2.2 x 10-24 N
D)  zeroE) None of the above
F) All of the above

Question 5

A current in a solenoid coil creates a magnetic field inside that coil.The field strength is directly proportional to:

Accepted Answer

A)  the coil area.
B)  the current.
C)  Both A and B are valid choices.
D)  None of the above choices are valid.E) B) and C)
F) All of the above

Question 6

A circular loop carrying a current of 1.0 A is oriented in a magnetic field of 0.35 T.The loop has an area of 0.24 m2 and is mounted on an axis,perpendicular to the magnetic field,which allows the loop to rotate.If the plane of the loop is oriented parallel to the field,what torque is created by the interaction of the loop current and the field?

Accepted Answer

A)  5.8 N*m
B)  0.68 N*m
C)  0.084 N*m
D)  0.017 N*mE) B) and D)
F) A) and D)

Question 7

A proton,which moves perpendicular to a magnetic field of 1.2 T in a circular path of radius 0.080 m,has what speed? (qp = 1.6 x 10-19 C and mp = 1.67 x 10-27 kg)

Accepted Answer

A)  3.4 x 106 m/s
B)  4.6 x 106 m/s
C)  9.6 x 106 m/s
D)  9.2 x 106 m/sE) All of the above
F) C) and D)

Question 8

An electron moves through a region of crossed electric and magnetic fields.The electric field E = 2 000 V/m and is directed straight down.The magnetic field B = 0.80 T and is directed to the left.For what velocity v of the electron into the paper will the electric force exactly cancel the magnetic force?

Accepted Answer

A)  2 500 m/s
B)  4 000 m/s
C)  5 000 m/s
D)  8 000 m/sE) B) and C)
F) A) and D)

Question 9

A stationary positive charge +Q is located in a magnetic field B,which is directed toward the right as indicated.The direction of the magnetic force on Q is:

Accepted Answer

A)  toward the right.
B)  up.
C)  down.
D)  There is no magnetic force.E) A) and D)
F) B) and D)

Question 10

Two insulated current-carrying straight wires of equal length are arranged in the lab so that Wire A carries a current northward and Wire B carries a current eastward,the wires crossing at their midpoints separated only by their insulation.Which of the following statements are true?

Accepted Answer

A)  The net force on Wire B is southward.
B)  The net force on Wire A is westward.
C)  There are no forces in this situation.
D)  There are forces,but the net force on each wire is zero.E) A) and B)
F) A) and C)

Question 11

A proton moving at a speed of 3.8 x 106 m/s cuts across the lines of a magnetic field at an angle of 70  °\degree° .The strength of the field is 0.25 x 10-4 T.What is the magnitude of the force acting on the proton? (qp = 1.6 x 10-19 C)

Accepted Answer

A)  5.1 x 10-18 N
B)  9.0 x 10-18 N
C)  1.4 x 10-17 N
D)  2.3 x 10-17 N E) A) and B)
F) A) and C)

Question 12

The magnetic domains in a non-magnetized piece of iron are characterized by which orientation?

Accepted Answer

A)  parallel to the magnetic axis
B)  anti-parallel (opposite direction) to the magnetic axis
C)  random
D)  perpendicular to the magnetic axisE) B) and D)
F) All of the above

Question 13

Two parallel wires are separated by 0.25 m.Wire A carries 5.0 A and Wire B carries 10 A,both currents in the same direction.The force on 0.80 m of Wire A is:

Accepted Answer

A)  3.2 x 10-5 N.
B)  2.6 x 10-5 N.
C)  1.6 x 10-5 N.
D)  less than 1.0 x 10-5 N.E) B) and C)
F) All of the above

Question 14

A copper wire of length 25 cm is in a magnetic field of 0.20 T.If it has a mass of 10 g,what is the minimum current through the wire that would cause a magnetic force equal to its weight?

Accepted Answer

A)  1.3 A
B)  1.5 A
C)  2.0 A
D)  4.9 AE) None of the above
F) B) and D)

Question 15

Two parallel conductors each of 0.50 m length,separated by 5.0 x 10-3 m and carrying 3.0 A in opposite directions,will experience what type and magnitude of mutual force? (magnetic permeability in empty space µ0 = 4p x 10-7 TF*m/A)

Accepted Answer

A)  attractive,0.06 x 10-4 N
B)  repulsive,0.60 x 10-4 N
C)  attractive,1.8 x 10-4 N
D)  repulsive,1.8 x 10-4 NE) A) and B)
F) None of the above

Question 16

Superconductors can carry very large currents with no resistance.If a superconducting wire is formed into a solenoid of length 50.0 cm with 500 turns,what is the magnetic field inside the solenoid when the current is 104 A? (µ0 = 4p x 10-7 T*m/A)

Accepted Answer

A)  1.25 T
B)  2.50 T
C)  6.28 T
D)  12.6 TE) None of the above
F) B) and C)

Question 17

A proton moves across the Earth's equator in a northeasterly direction.At this point the Earth's magnetic field has a direction due north and is parallel to the surface.What is the direction of the force acting on the proton at this instant?

Accepted Answer

A)  toward the northwest
B)  out of the Earth's surface
C)  into the Earth's surface
D)  toward the northeastE) B) and C)
F) B) and D)

Question 18

Magnetism had been a known phenomenon for some time before its relation to electric currents was found.That a current in a wire produces a magnetic field was discovered by:

Accepted Answer

A)  Maxwell.
B)  Ampere.
C)  Oersted.
D)  Tesla.E) A) and B)
F) A) and C)

Question 19

A proton moving with a speed of 3.0 x 105 m/s perpendicular to a uniform magnetic field of 0.20 T will follow which of the paths described below? (qp = 1.6 x 10-19 C and mp = 1.67 x 10-27 kg)

Accepted Answer

A)  a straight line path
B)  a circular path of 1.6 cm radius
C)  a circular path of 3.1 cm radius
D)  a circular path of 0.78 cm radiusE) A) and B)
F) A) and C)

Question 20

A proton with initial kinetic energy E is moving in circular motion in a uniform magnetic field.When it has completed one eighth of a revolution,what is its kinetic energy?

Accepted Answer

A)  1.4 E
B)  0.71 E
C)  E
D)  The value is not given.E) All of the above
F) C) and D)

Exam 19: Magnetism

A copper wire of length 25 cm is in a magnetic field of 0.20 T.If it has a mass of 10 g,what is the minimum current through the wire that would cause a magnetic force equal to its weight?

Correct Answer
verified

Two parallel conductors each of 0.50 m length,separated by 5.0 x 10^-3 m and carrying 3.0 A in opposite directions,will experience what type and magnitude of mutual force? (magnetic permeability in empty space µ₀ = 4p x 10^-7 TF*m/A)

Correct Answer
verified

Two parallel wires are separated by 0.25 m.Wire A carries 5.0 A and Wire B carries 10 A,both currents in the same direction.The force on 0.80 m of Wire A is:

Correct Answer
verified

Magnetism had been a known phenomenon for some time before its relation to electric currents was found.That a current in a wire produces a magnetic field was discovered by:

Correct Answer
verified

A proton moving with a speed of 3.0 x 10⁵ m/s perpendicular to a uniform magnetic field of 0.20 T will follow which of the paths described below? (q_p = 1.6 x 10^-19 C and m_p = 1.67 x 10^-27 kg)

Correct Answer
verified

A proton with initial kinetic energy E is moving in circular motion in a uniform magnetic field.When it has completed one eighth of a revolution,what is its kinetic energy?

Correct Answer
verified

If a proton is released at the equator and falls toward the Earth under the influence of gravity,the magnetic force on the proton will be toward the:

Correct Answer
verified

Two insulated current-carrying straight wires of equal length are arranged in the lab so that Wire A carries a current northward and Wire B carries a current eastward,the wires crossing at their midpoints separated only by their insulation.Which of the following statements are true?

Correct Answer
verified

A proton moves across the Earth's equator in a northeasterly direction.At this point the Earth's magnetic field has a direction due north and is parallel to the surface.What is the direction of the force acting on the proton at this instant?

Correct Answer
verified

Correct Answer
verified

Superconductors can carry very large currents with no resistance.If a superconducting wire is formed into a solenoid of length 50.0 cm with 500 turns,what is the magnetic field inside the solenoid when the current is 10⁴ A? (µ₀ = 4p x 10^-7 T*m/A)

Correct Answer
verified

Correct Answer
verified

A proton,which moves perpendicular to a magnetic field of 1.2 T in a circular path of radius 0.080 m,has what speed? (q_p = 1.6 x 10^-19 C and m_p = 1.67 x 10^-27 kg)

Correct Answer
verified

A rectangular coil (0.20 m x 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T.If the orientation of the coil is varied through all possible positions,the maximum torque on the coil by magnetic forces is 0.080 N*m.What is the current in the coil?

Correct Answer
verified

The magnetic domains in a non-magnetized piece of iron are characterized by which orientation?

Correct Answer
verified

A proton moving at a speed of 3.8 x 10⁶ m/s cuts across the lines of a magnetic field at an angle of 70 $\degree$ .The strength of the field is 0.25 x 10^-4 T.What is the magnitude of the force acting on the proton? (q_p = 1.6 x 10^-19 C)

Correct Answer
verified

A stationary positive charge +Q is located in a magnetic field B,which is directed toward the right as indicated.The direction of the magnetic force on Q is:

Correct Answer
verified

An electron which moves with a speed of 3.0 x 10⁴ m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (e = 1.6 x 10^-19 C)

Correct Answer
verified

A beam of electrons is sent in the positive x-direction in a region with a uniform magnetic field B in the positive y-direction and a uniform electric field E in the positive z-direction.At which of the following speeds would the electrons be deflected in the positive z-direction?

Correct Answer
verified

A current in a solenoid coil creates a magnetic field inside that coil.The field strength is directly proportional to:

Correct Answer
verified

Exam 19: Magnetism

A copper wire of length 25 cm is in a magnetic field of 0.20 T.If it has a mass of 10 g,what is the minimum current through the wire that would cause a magnetic force equal to its weight?

Correct AnswerverifiedShow Answer

Two parallel conductors each of 0.50 m length,separated by 5.0 x 10-3 m and carrying 3.0 A in opposite directions,will experience what type and magnitude of mutual force? (magnetic permeability in empty space µ0 = 4p x 10-7 TF*m/A)

Correct AnswerverifiedShow Answer

Two parallel wires are separated by 0.25 m.Wire A carries 5.0 A and Wire B carries 10 A,both currents in the same direction.The force on 0.80 m of Wire A is:

Correct AnswerverifiedShow Answer

Magnetism had been a known phenomenon for some time before its relation to electric currents was found.That a current in a wire produces a magnetic field was discovered by:

Correct AnswerverifiedShow Answer

A proton moving with a speed of 3.0 x 105 m/s perpendicular to a uniform magnetic field of 0.20 T will follow which of the paths described below? (qp = 1.6 x 10-19 C and mp = 1.67 x 10-27 kg)

Correct AnswerverifiedShow Answer

A proton with initial kinetic energy E is moving in circular motion in a uniform magnetic field.When it has completed one eighth of a revolution,what is its kinetic energy?

Correct AnswerverifiedShow Answer

If a proton is released at the equator and falls toward the Earth under the influence of gravity,the magnetic force on the proton will be toward the:

Correct AnswerverifiedShow Answer

Two insulated current-carrying straight wires of equal length are arranged in the lab so that Wire A carries a current northward and Wire B carries a current eastward,the wires crossing at their midpoints separated only by their insulation.Which of the following statements are true?

Correct AnswerverifiedShow Answer

A proton moves across the Earth's equator in a northeasterly direction.At this point the Earth's magnetic field has a direction due north and is parallel to the surface.What is the direction of the force acting on the proton at this instant?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Superconductors can carry very large currents with no resistance.If a superconducting wire is formed into a solenoid of length 50.0 cm with 500 turns,what is the magnetic field inside the solenoid when the current is 104 A? (µ0 = 4p x 10-7 T*m/A)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A proton,which moves perpendicular to a magnetic field of 1.2 T in a circular path of radius 0.080 m,has what speed? (qp = 1.6 x 10-19 C and mp = 1.67 x 10-27 kg)

Correct AnswerverifiedShow Answer

A rectangular coil (0.20 m x 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T.If the orientation of the coil is varied through all possible positions,the maximum torque on the coil by magnetic forces is 0.080 N*m.What is the current in the coil?

Correct AnswerverifiedShow Answer

The magnetic domains in a non-magnetized piece of iron are characterized by which orientation?

Correct AnswerverifiedShow Answer

A proton moving at a speed of 3.8 x 106 m/s cuts across the lines of a magnetic field at an angle of 70 °\degree° .The strength of the field is 0.25 x 10-4 T.What is the magnitude of the force acting on the proton? (qp = 1.6 x 10-19 C)

Correct AnswerverifiedShow Answer

A stationary positive charge +Q is located in a magnetic field B,which is directed toward the right as indicated.The direction of the magnetic force on Q is:

Correct AnswerverifiedShow Answer

An electron which moves with a speed of 3.0 x 104 m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (e = 1.6 x 10-19 C)

Correct AnswerverifiedShow Answer

A beam of electrons is sent in the positive x-direction in a region with a uniform magnetic field B in the positive y-direction and a uniform electric field E in the positive z-direction.At which of the following speeds would the electrons be deflected in the positive z-direction?

Correct AnswerverifiedShow Answer

A current in a solenoid coil creates a magnetic field inside that coil.The field strength is directly proportional to:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Two parallel conductors each of 0.50 m length,separated by 5.0 x 10^-3 m and carrying 3.0 A in opposite directions,will experience what type and magnitude of mutual force? (magnetic permeability in empty space µ₀ = 4p x 10^-7 TF*m/A)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A proton moving with a speed of 3.0 x 10⁵ m/s perpendicular to a uniform magnetic field of 0.20 T will follow which of the paths described below? (q_p = 1.6 x 10^-19 C and m_p = 1.67 x 10^-27 kg)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Superconductors can carry very large currents with no resistance.If a superconducting wire is formed into a solenoid of length 50.0 cm with 500 turns,what is the magnetic field inside the solenoid when the current is 10⁴ A? (µ₀ = 4p x 10^-7 T*m/A)

Correct Answer
verified

Correct Answer
verified

A proton,which moves perpendicular to a magnetic field of 1.2 T in a circular path of radius 0.080 m,has what speed? (q_p = 1.6 x 10^-19 C and m_p = 1.67 x 10^-27 kg)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A proton moving at a speed of 3.8 x 10⁶ m/s cuts across the lines of a magnetic field at an angle of 70 $\degree$ .The strength of the field is 0.25 x 10^-4 T.What is the magnitude of the force acting on the proton? (q_p = 1.6 x 10^-19 C)

Correct Answer
verified

Correct Answer
verified

An electron which moves with a speed of 3.0 x 10⁴ m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (e = 1.6 x 10^-19 C)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified