Moving Charges and Magnetism - Result Question 63
64. A circular coil $A B C D$ carrying a current $i$ is placed in a uniform magnetic field. If the magnetic force on the segment $A B$ is $\overrightarrow{{}F}$, the force on the remaining segment $B C D A$ is
[NEET Kar. 2013, 2010]
(a) $\overrightarrow{{}F}$
(b) $-\overrightarrow{{}F}$
(c) $3 \overrightarrow{{}F}$
(d) $-3 \overrightarrow{{}F}$
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Answer:
Correct Answer: 64. (b)
Solution:
- (b) Here, $ \vec{F} _{A B}+ \vec{F} _{B C D A}=\overrightarrow{{}0}$
$\Rightarrow \vec{F} _{B C D A}=- \vec{F} _{A B}=-\vec{F}$
$ (\because F _{A B}=\vec{F}) $
