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Question:

A moving coil galvanometer has a coil with 175 turns and area 1cm^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^o for a current of 1 mA. The value of B(in Telsa) is approximately.A moving coil galvanometer has a coil with 175 turns and area 1cm^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^o for a current of 1 mA. The value of B(in Telsa) is approximately.A10^-310^-3B10^-210^-2C10^-410−4D10−1;10−1;?

10−3

10−2;

10−4

10−1;

Solution:

Correct option is A.10−3τ=M→×B→Cθ=iNAB10−6;×π180=10−3×10−4×175×BB=10−3Telsa.