A long solenoid of diameter 
has 
turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 
is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to 
A from 4 A in 0.05 
. Ifthe resistance ofthe coil is 
the total charge flowing through the coil during this time is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Given 
Initially 
or 
Finally, the magnetic field at the center of the solenoid is given as
Final magnetic flux through the coil is given as 
Induced charge,
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