A small flat search coils of area 4 cm 2 with 20 closely wound turns is positioned normal to the field direction and then quickly snatched out of the field region. The total charge flowing in the coil (measured by a ballistic galvanometer connected to the coil) is 7.5 mC. The resistance of the coil and galvanometer is 0.8 
The field strength of the magnet is
Text Solution
Verified by ExpertsThe correct answer is:
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Here , 
Final flux 
(when the coil is removed from the field)
As 
Also charge,
Now, initial flux per turn when coil is normal to the
field
Or 
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