Moving Charges and Magnetism - Result Question 7

7. Two identical bar magnets are fixed with their centres at a distance $d$ apart. A stationary charge $Q$ is placed at $P$ in between the gap of the two magnets at a distance $D$ from the centre $O$ as shown in the Figure

[2010]

The force on the charge $Q$ is

(a) directed perpendicular to the plane of paper

(b) zero

(c) directed along $O P$

(d) directed along $P O$

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Answer:

Correct Answer: 7. (b)

Solution:

  1. (b) Force on a charged particle is given by $F$ $=q v B$. Here $v=0$ and also resultant $B$ is zero. $\therefore$ Force $=0$