NUMERIC RESPONSE
A bar magnet has coercivity 
. It is desired to demagnetise it by inserting it inside a solenoid 
long and having 60 turns. The current that should be sent through the solenoid is A.
Text Solution
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NUMERIC RESPONSE
(8) The bar magnet has coercivity 
, i.e., it requires a magnetic intensity 
to get demagnetised. Let 
be the current carried by solenoid having 
number of turns per metre length, then by definition 
ni. Here 
amp turn metre 
turn metre 
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