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Question

A force F acting on an electric charge q in presence of an electromagnetic field, moves the charge parallel to the magnetic field with velocity v. Then, F is equal to(where E and B are electric field and magnetic field, respectively) ___________.

A
qE
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B
q(v×B)
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C
q(v×E)
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D
qB
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Solution

The correct option is A qE
Net Lorentz force acting on the particle F=q(E+v×B)
Since, velocity is parallel to magnetic field.
v×B=0
Thus force acting on the particle F=qE

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