Question

A rectangular coil has 200 turns each of area 50 cm² . It is capable of rotation about an axis joining the mid points of two opposite sides. When a current of 10 A is passed through it while its plane is at right angles to a uniform magnetic field, it experiences a torque of 5 Nm. The magnetic field will be ____________.

Options

• 1 T

• 2 T

• 0.5 T

• 1.5 T

Answer 1

A rectangular coil has 200 turns each of area 50 cm² . It is capable of rotation about an axis joining the mid points of two opposite sides. When a current of 10 A is passed through it while its plane is at right angles to a uniform magnetic field, it experiences a torque of 5 Nm. The magnetic field will be 0.5 T.

Explanation:

`"B" = tau/"NIA"`

`= 5/(200 xx 10 xx 50 xx 10^-4)`

`= 0.5  "T"`