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As shown in the figure, a battery of emf  is connected to an inductor L and resistance R in s eries. The switch is closed at t = 0 . The total charge that flows from battery between t = 0 and t = t C (t C is the time constant of the circuit) is : R L S  

1. 2 eL R 
2. 2 eR L 
3. 2 R L 
4.        e 1 – 1 R L 2

Correct answer: 2 eR L 

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