The effective radius of a circular coil is R and the number of turns is N. The current through it is i amperes. The work done in rotating the coil by an angle of 180° in an external magnetic field B will be: A. 2πNiR^2B B. 2πNiR^2B C. (2NiB)πR^2 D. zero
Added by Donald M.
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The magnetic moment of the circular coil is given by the formula: $\mu = Ni\pi R^2$. Show more…
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