There are two long co-axial solenoids of same length 
. The inner and outer coils have radii 
and 
and number of turns per unit length 
and 
respectively. The rate of mutual inductance to the self-inductance of the inner-coil is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
JEE MAIN 2019
The rate of mutual inductance is given by
… (i)
The rate of self inductance is given by
… (ii)
Dividing (i) by (ii)
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