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Q.

A toroid of mean radius ' a ' , cross section radius ' r ' and total number of turns N carries a current ' i '. The torque experienced by the toroid if a uniform magnetic field of strength B is applied

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a

is B i N πr2

b

is B i πa2 

c

is zero

d

depends on the direction of ‘i ‘

answer is A.

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Detailed Solution

detailed_solution_thumbnail

The resultant magnetic dipole moment of toroid is zero.
Hence torque acting on it is zero.

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