A moving coil galvanometer has a rectangular wire coil of enclosed area 0.001 `m^(2)` and 500 turns. The coil operates in a radial mafnetic field of 0.2T and carries a current of `6pixx10^(-8)` A.
If the torsional spring constant is `6xx10^(-7)N-` m/rad, then angular deflection of the coil in radians is

Options

A. `(pi)/(100)`
B. `(pi)/(200)`
C. `(pi)/(300)`
D. `(pi)/(400)`

Answer

A

Explanation

Angular defiection of a moving coil galvanometer is given by
`theta = ((NBA)/(k))i`
`(500xx0.2xx0.001)/(6xx10^(-7))xx6pixx10^(-8)`
`(5xx0.2xx10^(-1)xx6pixx10^-(8))/(6xx10)^(-7)`
`theta=(pi)/(100)`