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## QuestionPhysicsClass 12

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) $${0.0002}{m}{H}$$