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>>Class 12
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>>Magnetism and Matter
>>Hysteresis Loop
>> $The coercivity of a magnet is 3 \times 10^3Am$

Question

The coercivity of a magnet is $3 \times 1 0^{3} A m^{- 1}$ . What current should be passed through a solenoid of length $10 c m$ and number of turns $50$ that the magnet is demagnetized when inserted in it?

A

$3 A$

B

$6 A$

C

$9 A$

D

$12 A$

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Updated on : 2022-09-05

Solution

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Correct option is B)

Length of solenoid   $L = 10 c m = 0.1 m$
Number of turns $N = 50$
So, number of turns per unit length   $n = \frac{N}{L} = \frac{5 0}{0 . 1} = 500$
Current to be passed   $i = \frac{H}{n}$
$⟹ i = \frac{3 \times 1 0 ^{3}}{5 0 0} = 6 A$

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