Question

In the following circuit, the switch S is closed at t = 0. The rate of change of current di/dt(0⁺) is given by

(A) 0

(B) R_sI_s/L

(C) (R + R_s)I_s/L

(D) ∞

Answer 1

Correct option: (B)

Explanation:

from (1)

As the switch is closed at t = 0⁺ 

⇒ i(0⁺) = 0 = i(0^-)   .....(2)

Apply KVL in ckt(1) after closing the switch

Hence alternative (b) is the correct option.