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Consider an RL series circuit having resistance R = 3 Ω, inductance L = 3 H and is excited by 6V. The current after a long time after closing of switch is ____________(a) 1 A(b) 2 A(c) 0 A(d) InfinityI have been asked this question by my school teacher while I was bunking the class.Question is taken from Series-Parallel Interconnection of Two Port Network topic in chapter Two-Port Networks of Network Theory

Answer»

The correct choice is (b) 2 A

To elaborate: At t = ∞ the circuit has effectively two 6Ω RESISTANCES in parallel.

So, REQ = \(\frac{6 X 6}{6 + 6}\)

= \(\frac{36}{12}\) = 3 Ω

Given voltage = 6 V

So, CURRENT = 2 A.


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