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The coefficient of self-inductance of a solenoid is \({0.18}{m}{H}\). If a crude of soft iron of relative permeability \({900}\) is inserted, then the coeffcient of self-inductance will become nearly
(A) \({5.4}{m}{H}\)
(B) \({162}{m}{H}\)
(C) \({0.006}{m}{H}\)
(D) \({0.0002}{m}{H}\)

Answer

Answer: B
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