$A$ current of $20\,\mu A$ flows for $30$ seconds in a wire. The total charge transferred will be:

The current flowing through a wire varies with time according to the formula $I = 3t^2 + 2t + 5$. The total charge passing through a cross-section of the wire in the interval from $t = 0$ to $t = 2$ seconds is ........... $C$.

In a closed circuit,the current at time $t$ is given by $I = 4 - 0.08t$. The number of electrons passing through the cross-section of the conductor in $50 \ s$ will be:

$A$ steady current $i$ is flowing through a conductor of uniform cross-section. Any segment of the conductor has

The following figure shows four situations in which positive and negative charges move horizontally through a region and gives the rate at which each charge moves. Rank the situations according to the effective current through the region,greatest first.

Due to what is current formed in conductors?