A bar magnet is demagnetized inside a solenoid of length 0.2 m, 100 turns, carrying 5.2 A. Find the coercivity in A/m.
Physics · Magnetic effect of current
JEE Mains

Question

A bar magnet is demagnetized inside a solenoid of length 0.2 m, 100 turns, carrying 5.2 A. Find the coercivity in A/m.

G1 Physics · Accepted Answer

Coercive field equals solenoid H=NI/ℓ=(100×5.2)/0.2=2600 A/m.