A rectangular loop carrying a current i is placed in a uniform magnetic field B. The area enclosed by the loop is A. If there are n turns in the loop, the torque acting on the loop is given by
ni(¯AׯB)
ni(¯A.¯B)
i(¯AׯB)n
i(¯A.¯B)n
A
i(¯AׯB)n
B
ni(¯A.¯B)
C
ni(¯AׯB)
D
i(¯A.¯B)n
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Solution
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→τ=→M×→B =ni(→A×→B)(∵→M=ni→A)
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