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A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is
(a) 20 seconds
(b) 5 seconds
(c) 1/5 seconds
(d) 40 seconds
(b)
Time constant is L/R
Given, L = 40H & R = 8W
.''. t = 40/8 = 5 sec.
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