A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The coercivitv of the bar magnet is :

Question

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The coercivitv of the bar magnet is : (A) 1200 A/m (B) 2600 A/m (C) 520 A/jm (D) 285 A/m

Tardigrade Admin · Accepted Answer

Coercivity = H = (B/μ0) =ni = (N/ℓ)i = (100/0.2) ×5.2 = 2600 A/m

Q. A bar magnet is demagnetized by inserting it inside a solenoid of length $0.2 m$ , $100 t u r n s$ , and carrying a current of $5.2 A$ . The coercivitv of the bar magnet is :

1200 A/m

2600 A/m

520 A/jm

285 A/m

Coercivity = $H = \frac{B}{μ _{0}}$
$= ni = \frac{N}{ℓ} i = \frac{100}{0.2} \times 5.2$
= $2600 A / m$

Q. A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2m, 100turns, and carrying a current of 5.2A. The coercivitv of the bar magnet is :