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A moving coil galvanometer has a coil wi...

A moving coil galvanometer has a coil with 175 turns and area `1 cm^(2)`. It uses a torsion band of torsion constant `10^(6)` N-m/rad. The coil is placed in a magnetic field B parallel to its plane. The coil deflects by 1° for a current of 1 mA. The value of B (in Tesla) is approximately

A

`10^(-1)`

B

`10^(-4)`

C

`10^(-3)`

D

`10^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`T = MB, C phi = NIAB`
`B = (10^(-6) xx pi)/(175 xx 10^(-4) xx 10^(-3)) = 10^(-3) T`
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