A copper wire is wound on a wooden frame, whose shape is that of a square if each side of the frame is increased by a factor of 3 , keeping the number of turns of the coil per unit length of the frame the same, then the self-inductance of the coil:
A
increases by a factor of 3
B
decreases by a factor of 
C
increases by a factor of 27
D
decreases by a factor of 9
Text Solution
Verified by ExpertsThe correct answer is:
A
Total length 
will remain constant
So self-inductance will become 3 times
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