JEE Main 2015 Physics question
A cm long solenoid has the radius cm and turns. It carries a current of A. If it is equivalent to a magnet of the same size and magnetization , then is:
Answer: (2)
Solution
The magnetic moment of a solenoid is , where is the cross-sectional area. Its volume is . Hence — the area cancels, so the radius is irrelevant. Substituting, A
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