Questions
Two coils are made of copper wires of same length. In the first coil the number of turns is 3 n and radius is r. In the second coil number of turns is n and the radius is 3r. The ratio of self-inductances of the coils will be
detailed solution
Correct option is A
The self-inductance of the coil isL=μ0πN2r2 or L∝N2r ∴L1L2=N1N22r1r2=3nn2r3r=3:1Talk to our academic expert!
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