A small square loop of wire of side I is placed inside a large square loop of wire of side L (> > l). The loops are coplanar and their centres coincide. What is the mutual inductance of the system?
A
B
C
D
Text Solution
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Let the current I be flowing in the larger loop.
The larger loop is made up of four wires each of length L, the field at the centre i.e, at a distance 
from each wire will be
Flux linked with smaller loop
Hence 
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