A long straight circular conductor placed in air is carrying a current of 250 A. Find the magnetising force at a distance of 5 cm from the conductor.

Question

Question

This question was previously asked in

SSC JE EE Previous Paper 11 (Held on: 24 March 2021 Morning)

Answer 1

The magnetizing field strength due to long straight circular conductor is given by

Where, H = Magnetizing force (AT/m)

I = Current flowing in a conductor (A)

r = Distance between current carrying conductor and the point (m)

also B = μ0 H

Where, B = Magnetic flux density (Wb/m2)

μ0 = Absolute permeability = 4π × 10-7 H/m

Calculation:

Given:

r = 5 cm = 5 × 10-2 m

I = 250 A

Important Points

Magnetic flux density of coil is given by T

Magnetic flux density of solenoid is given by T

Magnetic flux density of long straight wire T