Question

The coercivity of a magnet is . What current should be passed through a solenoid of length and number of turns that the magnet is demagnetized when inserted in it?

A

B

C

D

Hard
Updated on : 2022-09-05
Solution
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Correct option is B)

Length of solenoid  
Number of turns 
So, number of turns per unit length  
Current to be passed  

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