In the given circuit,if the measuring instruments are ideal,then the reading of ammeter $A_1$ is:

The effective resistance between $A$ and $B$ of the shown network,where the resistance of each resistor is $R$,is

The charge flowing through a resistor $R$ varies with time $t$ as $Q = 3t - 6t^2$. The heat produced in $R$ until the current in it becomes zero is:

$A$ copper voltameter and a silver voltameter are connected in parallel. When a total charge $q$ flows through the voltameters,an equal mass of metal is deposited in each. If the electrochemical equivalents of copper and silver are $z_1$ and $z_2$ respectively,then the charge flowing through the silver voltameter is:

In the given electrical circuit,the potential difference between points $P$ and $Q$ is ........... $V$.

An infinite ladder network is arranged with resistances $R$ and $2R$ as shown. The effective resistance between terminals $A$ and $B$ is