Two circuits like the one shown in the above left circuit are identical except f

Question

Two circuits like the one shown in the above left circuit are identical except for the value of L. In circuit A, the inductance of the inductor is L_A, and in circuit B,it is L_B. The switch has been in position b for both circuits for a long time. At t =0, the switch is thrown to a in both circuits.At t=10s, the switch is thrown to b in both circuits. The resulting graphical representation of the current as a function of time is given in the above figure on the right. Point out inaccuracies in the above graph.

Explanation / Answer

after 10 secs , we have the discharge curve.

I = V/R

V = V(10) * exp(-t*L/R)

hence I can never reach 0 in 15 sec as shown in the graph.

this is the inaccuracy and it is in the blue line

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