The coercivity of a magnet is A/m. The amount of current required to be passed in a solenoid of length 30 cm and the number of turns 150, so that the magnet gets demagnetised when inside the solenoid is _____ A

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Solution

Q.
The coercivity of a magnet is $5 \times 10^{3}$ A/m. The amount of current required to be passed in a solenoid of length 30 cm and the number of turns 150, so that the magnet gets demagnetised when inside the solenoid is _____ A. [2024]

Ans.
(10)    $L e n g t h o f s o l e n o i d (λ) = 30 c m, N o . o f t u r n s (n) = 150$ $a n d$ $H = 5 \times 10^{3}$ $A / m$

   $W e k n o w n = \frac{N}{I} \Rightarrow I = \frac{N}{n}$

   $I = \frac{5 \times 10^{3} \times 0.3}{150} = 10 A$

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