A rectangular coil of 100 turns each of area `10 cm^2` hangs freely in radial magnetic field. The coil deflects through an angle of `30^@` when curren
A rectangular coil of 100 turns each of area `10 cm^2` hangs freely in radial magnetic field. The coil deflects through an angle of `30^@` when current of 0.5 m A is paased through it . If torsional constant of suspension fibre is `2.5 xx10^-9` Nm/rad, then magnetic field will be ,
A. `3.6xx10^-5Wb//m^2`
B. `2.2xx10^-5Wb//m^2`
C. `2.6xx10^-5Wb//m^2`
D. `4.2xx10^-5Wb//m^2`
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Correct Answer - C
`B=(K theta )/(n AI)=(2.5xx10^-9xx5)/(10^2xx10^-3xx5xx6xx10^-4)`
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