A rectangular coil of M.C.G. of 100 turns , each of length 4 cm and breadth 3 cm , is suspended freely in a radial magnetic field of induction `2xx10^-2` N/Am. The torsional constant of the suspension fibre is `2xx10^-8` Nm per radian. The deflection of the coil when a current of `2 mu A` is passed through it is nearly .A. `14^@`B. `12^@`C. `13^@`D. `15^@`

A rectangular coil of M.C.G. of 100 turns , each of length 4 cm and br

1.	A rectangular coil of M.C.G. of 100 turns , each of length 4 cm and breadth 3 cm , is suspended freely in a radial magnetic field of induction `2xx10^-2` N/Am. The torsional constant of the suspension fibre is `2xx10^-8` Nm per radian. The deflection of the coil when a current of `2 mu A` is passed through it is nearly .A. `14^@`B. `12^@`C. `13^@`D. `15^@`
Answer» Correct Answer - A `theta = (B n AI)/(K)=(2xx10^-2xx10^2xx12xx10^-4xx2xx10^-6)/(2xx10^-8)` `=0.24 xx(180)/(pi) prop 14^@`.

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