A) Number of turns per unit length
B) Current flowing
C) Radius of the solenoid
D) All of the above three
Correct Answer: C
Solution :
Here \[B={{\mu }_{0}}ni\] where n is number of turns per unit length \[\tau =NBiA=100\times 0.5\times 1\times 400\times {{10}^{-4}}=2\ N-m\]
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