The value of i (t) < 0 is given by the relation for the

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The value of i (t) < 0 is given by the relation for the circuit shown below—

1. [1 – (– 2.5)] e ^{– 1 / 0.1} – .25
2. [1 + (– 2.5)] e ^{– 1 / 0.1} + .25
3. [1 + 2.5] e ^{– 1 / 100} + .25
4. 1 u (– t)

Correct Option: D

For t < 0, 50 u (t) → not exist, so the circuit becomes like

i _L (0^–) = i _L (0⁺) = 2 ×	10	= 1 amp.
	10 + 10

so, i (t) = 1 u (– t)