Electro Magnetic Induction And Alternating Currents Question 494

Question: A wire of fixed lengths is wound on a solenoid of length and radius r. Its self-inductance is found to be L. Now if same wire is wound on a solenoid of length /2 and radius r/2, then the self in- ductance will be -

Options:

A) 2L

B) L

C) 4L

D) 8L

Show Answer

Answer:

Correct Answer: A

Solution:

  • L=μ0N2πr2 Length of wire=N

    2πr =constant (=C, suppose)

    L=μ0(C2πr)2πr2

    L1

    Self-inductance will become 2L.



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