Which of the following statements for magnetism are true? (Give ALL correct answ

Question

Which of the following statements for magnetism are true? (Give ALL correct answers, i.e., B, AC, BCD...)
A) A charged particle in the presence of a uniform magnetic field perpendicular to the velocity vector must travel in a circular path (assuming no other forces are acting). B) The magnitude of earth's B field is about 1E-4 Tesla. C) Magnetic fields do work on a charge when the charge has a velocity component perpendicular to B. D) A magnetic field acts only on charges at rest. E) For a bar magnet, the B-lines exit through the N pole and return through the S pole. F) Magnetic fields do work on a charge when the charge has a velocity component parallel to B. G) Unlike magnetic poles attract. Which of the following statements for magnetism are true? (Give ALL correct answers, i.e., B, AC, BCD...)
A) A charged particle in the presence of a uniform magnetic field perpendicular to the velocity vector must travel in a circular path (assuming no other forces are acting). B) The magnitude of earth's B field is about 1E-4 Tesla. C) Magnetic fields do work on a charge when the charge has a velocity component perpendicular to B. D) A magnetic field acts only on charges at rest. E) For a bar magnet, the B-lines exit through the N pole and return through the S pole. F) Magnetic fields do work on a charge when the charge has a velocity component parallel to B. G) Unlike magnetic poles attract.
A) A charged particle in the presence of a uniform magnetic field perpendicular to the velocity vector must travel in a circular path (assuming no other forces are acting). B) The magnitude of earth's B field is about 1E-4 Tesla. C) Magnetic fields do work on a charge when the charge has a velocity component perpendicular to B. D) A magnetic field acts only on charges at rest. E) For a bar magnet, the B-lines exit through the N pole and return through the S pole. F) Magnetic fields do work on a charge when the charge has a velocity component parallel to B. A) A charged particle in the presence of a uniform magnetic field perpendicular to the velocity vector must travel in a circular path (assuming no other forces are acting). B) The magnitude of earth's B field is about 1E-4 Tesla. C) Magnetic fields do work on a charge when the charge has a velocity component perpendicular to B. D) A magnetic field acts only on charges at rest. E) For a bar magnet, the B-lines exit through the N pole and return through the S pole. F) Magnetic fields do work on a charge when the charge has a velocity component parallel to B. G) Unlike magnetic poles attract.

Explanation / Answer

A) as force = q(vxB) which will be perpendicular to the motion

B) yes it is around 10^-5 T

C) no work can be done by B field

E) fact

F)no force hence zero work

G) fact

right options are

A B E G

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