Question

Assertion: When a ferromagnetic rod is inserted inside an inductor, then current in L-C-R, alternating circuit will decrease.
Reason: By inserting the ferromagnetic rod inside the inductor, coefficient of self induction and hence the net impedance will increases.
A. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If both Assertion and Reason are false.

Answer 1

e) `Z=sqrt(R^(2)+(X_(L)-X_(C))^(2))`
By inserting the ferromagnetic rod L, and therefore `X_(L)` will increase. But value of Z and therefore I may increase, decrease or remain same.