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