First slide

Solenoid

Question

The coercivity of a bar magnet is 120 A/m. It is to be demagnetised by placing it inside a solenoid of length 120 cm and number of tums 72. The current flowing through the solenoid is

Moderate

A

1A
B

0.5A
C

2A
D

3A

Solution

See fig. . In figure OC, represents the coercivity.
OC = H = ni
where n is number of turns per unit length. Here,
$n = \frac{72}{120} \times 100 = 60$
and H = 120A/m
$∴ i = \frac{H}{n} = \frac{120}{60} = 2 A$

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