The coercive force for certain permanent magnet is 2× 104Am- 1 . This magnet is placed inside a Iong solenoid of 40 turns cm- 1 and a current is passed in the solenoid to demagnetize the magnet. The value of current (in A ) is

Question

The coercive force for certain permanent magnet is 2× 104Am- 1 . This magnet is placed inside a Iong solenoid of 40 turns cm- 1 and a current is passed in the solenoid to demagnetize the magnet. The value of current (in A ) is (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

H=B/μ 0 ni=2× 104 40× 100i=2× 104 I=(20/4)A=5A

Q. The coercive force for certain permanent magnet is $2 \times 1 0^{4} A m^{- 1}$ . This magnet is placed inside a Iong solenoid of $40$ turns $c m^{- 1}$ and a current is passed in the solenoid to demagnetize the magnet. The value of current (in $A$ ) is

$H = B / μ_{0}$
$ni = 2 \times 1 0^{4}$
$40 \times 100 i = 2 \times 1 0^{4}$
$I = \frac{20}{4} A = 5 A$

Q. The coercive force for certain permanent magnet is 2×104Am−1 . This magnet is placed inside a Iong solenoid of 40 turns cm−1 and a current is passed in the solenoid to demagnetize the magnet. The value of current (in A ) is

H=B/μ0​ ni=2×104 40×100i=2×104 I=420​A=5A

Q. The coercive force for certain permanent magnet is $2 \times 1 0^{4} A m^{- 1}$ . This magnet is placed inside a Iong solenoid of $40$ turns $c m^{- 1}$ and a current is passed in the solenoid to demagnetize the magnet. The value of current (in $A$ ) is

$H = B / μ_{0}$
$ni = 2 \times 1 0^{4}$
$40 \times 100 i = 2 \times 1 0^{4}$
$I = \frac{20}{4} A = 5 A$