A bar magnet has coercivity 
. It is placed inside a solenoid of 
length and 60 turns. The current that should be passed through the solenoid to demagnetise the bar magnet is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Coercivity of bar magnet, 
Length of solenoid, 
Number of turns, 
turns
Current, 
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