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Which of the following is NOT true of a magnetic field?
A. It can be generated by a moving charge.
B. It can accelerate a moving charge.
C. It can exert a force on a moving charge.
D. It can increase the speed of a moving charge.
Answer is D. What is the difference between B and D?
The explanation says "Since the magnetic force FB on a charged particle q is always perpendicular to the velocity v of the particlebecause FB = q(v ×B)the force FB can do no work on q. Therefore, by the workenergy theorem, W = DKE, FB cannot change the kinetic energy (or, therefore, the speed) of q. Thus, statement D is false."
Any help please? I don't get it. Thanks
A. It can be generated by a moving charge.
B. It can accelerate a moving charge.
C. It can exert a force on a moving charge.
D. It can increase the speed of a moving charge.
Answer is D. What is the difference between B and D?
The explanation says "Since the magnetic force FB on a charged particle q is always perpendicular to the velocity v of the particlebecause FB = q(v ×B)the force FB can do no work on q. Therefore, by the workenergy theorem, W = DKE, FB cannot change the kinetic energy (or, therefore, the speed) of q. Thus, statement D is false."
Any help please? I don't get it. Thanks