The B-H curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with 1000 turns cm -1. The current (in mA ) that should be passed in the solenoid in Ampere to demagnetise the ferromagnet completely is

Question

The B-H curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with 1000 turns cm -1. The current (in mA ) that should be passed in the solenoid in Ampere to demagnetise the ferromagnet completely is (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Coercivity of ferromagnet, H =100 A / m. n × I =100 I =(100/105)=1 mA

Q. The $B - H$ curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with $1000$ turns $c m^{- 1}$ . The current (in $m A$ ) that should be passed in the solenoid in Ampere to demagnetise the ferromagnet completely is

Coercivity of ferromagnet, $H = 100 A / m$ .
$n \times I = 100$
$I = \frac{100}{1 0 ^{5}} = 1 m A$

Q. The B−H curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with 1000 turns cm−1. The current (in mA ) that should be passed in the solenoid in Ampere to demagnetise the ferromagnet completely is

Coercivity of ferromagnet, H=100A/m. n×I=100 I=105100​=1mA

Q. The $B - H$ curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with $1000$ turns $c m^{- 1}$ . The current (in $m A$ ) that should be passed in the solenoid in Ampere to demagnetise the ferromagnet completely is

Coercivity of ferromagnet, $H = 100 A / m$ .
$n \times I = 100$
$I = \frac{100}{1 0 ^{5}} = 1 m A$