Charging Of Battery And Discharging Of Battery MCQ - Practice Questions with Answers

The length of a wire of a potentiometer is 100 cm and the e.m.f. of its standard cell is E volt. It is employed to measure the e.m.f. of a battery whose internal resistance is 0.5   If the balance point is obtained at cm from the positive end, the e.m.f. of the battery is :

A student measures the terminal potential difference (V) of a cell (of emf E and internal resistance r) as a function of the current (I) flowing through it. The slope and intercept, of the graph between V and I, then, respectively, equal:

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When a capacitor is connected to a battery through a resistance , the plates of the capacitor will acquire equal and opposite charge and potential difference across it become equal to the emf of battery. The process called charging takes sometime and during this time there is an electric current through the resistance. If at any time t, q is the charge on capacitor, then from Kirchoff's law.

In the circuit shown, the battery is ideal with emf . The capacitor is initially uncharged. The switch is closed at 

Question:-

The charge on the capacitor at time is