If $E_0$ represents the peak value of the voltage in an ac circuit, the r.m.s. value of the voltage will be[

The current lags behind the voltage by a phase different of $\pi /2$ radian, when in the circuit is:

A cell of negligible resistance and emf $2$ volt is connected to a series combination of $2, 3$ and $5$ ohm. The potential difference in volts between the terminals of $3$-ohm resistance will be:

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