A circular coil of wire of 200 turns and diameter 2.0 cm carries a current of 4.0 A. It is placed in a magnetic field of with the plane of the coil making an angle of 30° with the magnetic field. What is the magnetic torque on the coil?

A circular coil of wire of 200 turns and diameter 2.0 cm carries a current of 4.0 A. It is placed in a magnetic field of 0.70 T with the plane of the coil making an angle of 30° with the magnetic field. What is the magnetic torque on the coil?

Magnetic torque on the coil = 0.08796 N.m

Explanation:

Given:

A circular coil with N turns and I current along with its diameter d which makes an angle (\theta) .

Number of turns of the coil, N = 200

External magnetic field, B = 0.7 T

Current in the circular coil, I = 4 A

Diameter of the coil, d = 2 cm = 0.02 m

Angle between the coil and B , = 30°

Formula to be used:

Magnetic torque in a circular coil:

⇒  

⇒                        ...Area of cross section = πd^2/4

⇒ Plugging the values.

⇒

⇒   ...sin(30)=0.5

⇒

So,

The magnetic torque on the coil = 0.08796 N.m

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).