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In the shown circuit involving a resist...

In the shown circuit involving a resistor of resistance `R Omega`, capacitor of capacitance C farad and an ideal cell of emf E volts, the capacitor is initially uncharged and the key is in position 1. At t = 0 second the key is pushed to position 2 for `t_(0) = RC` seconds and then key is pushed back to position 1 for `t_(0) = RC`seconds. This process is repeated again and again. Assume the time taken to push key from position 1 to 2 and vice verse to be negligible.

Then the variation of charge on capacitor with time is best represented by

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