A square coil of side 10 cm consists of 20 turns and carries a current of 12A. The coil is suspended vertically and normal to the plane of the coil, makes an angle of `30^(@)` with the direction of a uniform horizontal magnetic field of magnitude 0.80T. What is the magnitude of torque experienced by the coil?

Explanation

Area of the square coil `=A=l^(2)`.
`A=(0.1m)^(2)=10^(-2)m^(2).`
`N=20, I=12A, theta =30^(@), B=0.80T, sin30^(@)=1//2`
Torque experienced by the coil,
`" "tau=BANIsintheta.`
i.e., `" "tau=0.8 times 10^(-2) times 20 times 12 times 1//2 Nm`
i.e., `" "tau=0.96 Nm`