The coercivity of a magnet is 5 × 1 0 3 A / m . The amount of current required to be passed in a solenoid of length 30 cm and the number of turns 150 , so that the magnet gets demagnetised when inside

Question

The coercivity of a magnet is 5 × 1 0 3 A / m . The amount of current required to be passed in a solenoid of length 30 cm and the number of turns 150 , so that the magnet gets demagnetised when inside the solenoid is _____A.

TestHub · Accepted Answer

​ H c ​ = μ o ​ μ o ​ ni ​ 5 × 1 0 3 = 30 150 ​ × 100 × i 5 50 ​ = i I = 10 ​

Physics - Magnetism Question with Solution | TestHub

Doubts & Discussion