Electro Magnetic Induction And Alternating Currents Question 530

Question: The coefficient of self inductance of a solenoid is 0.18 mH. If a crode of soft iron of relative permeability 900 is inserted, then the coefficient of self inductance will become nearly

Options:

A) 5.4 mH

B) 162 mH

C) 0.006 mH

D) 0.0002 mH

Show Answer

Answer:

Correct Answer: B

Solution:

$ L=\mu ni $

Þ $ \frac{L_{2}}{L_{1}}=\frac{\mu }{{\mu_{0}}} $ ( n and i are same)

Þ $ L_{2}={\mu_{r}}L_{1}=900\times 0.18=162,mH $



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