question_answer

A negative test charge is moving near a long straight wire carrying a current. The force acting on the test charge is parallel to the direction of the current. The motion of the charge is -    [JEE Online 09-04-2017]

A) away from the wire

B) towards the wire

C) parallel to the wire along the current

D) parallel to the wire opposite to the current

Correct Answer: B

Solution :

[b] \[\vec{F}=q(\vec{v}\times \vec{B})\]