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Q.

A bar magnet has coercivity of $4 \times 10^{3} A / m$ . It is desired to demagnetize it by inserting it inside a solenoid 12cm long having 60 turns. What current ( in A ) should be sent through the solenoid ?

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a

8

b

6

c

4

d

5

answer is C.

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Detailed Solution

Given $H = 4 \times 10^{3} A / m$

$N = 60$
Formula $H = \frac{N i}{L}$

$\Rightarrow i = \frac{H L}{N} = \frac{4 \times 10^{3} \times 0.12}{60} = 8 A$

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A bar magnet has coercivity of 4×103 A/m . It is desired to demagnetize it by inserting it inside a solenoid 12cm long having 60 turns. What current ( in A ) should be sent through the solenoid ?