Magnetic Effects Of Current Question 211
Question: The magnetic moment of a circular coil carrying current is [MP PET 2000]
Options:
A) Directly proportional to the number of turns in the coil
B) Inversely proportional to the number of turns in the coil
C) Directly proportional to the square of the number of turns in the coil
D) Inversely proportional to the square of the distance from the wire in the coil
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Answer:
Correct Answer: C
Solution:
$ M=NiA\Rightarrow M\propto A $
$ \Rightarrow M\propto r^{2} $ $ ( \text{As}\ l=2\pi r\Rightarrow l\propto r ) $
Þ $ M\propto l^{2} $
BETA
