# The coercive forc

Given:

Coercive force for magnet =4.0× 104Am-1

No. of turns per cm inside solenoid=40

No. of turns per m inside the solenoid =4000 turns/m

We know that,

Coercive force is defined by

Coercive force: the value of magnetic intensity (H) needed to make magnetization(I) zero is known as coercive force .

Therefore, magnetic intensity H=4.0× 104Am-1

Magnetic field produced by solenoid at the centre (B) is given by

…(i)

Where,

n=no. of turns per unit length

I=current in the solenoid

μ0=absolute permeability of vacuum

also magnetizing field intensity (H) in the absence of any material is given by

Where

B=net magnetic field

Putting the value of eqn.(i)

Putting the values of n and H

Therefore, current is given by 10A

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