A bar magnet has a coercivity of 
. It is placed inside a solenoid of length 12 cm having 60 turns in order to demagnetise it. The amount of current that should be passed through the solenoid is
Text Solution
Verified by ExpertsThe correct answer is:
B
The coercivity of bar magnet 
Length of solenoid 
and number of turns 
The coercivity of 12 cm length of solenoid
Now, current through each turn to demagnetize
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