The current $I$ versus time $t$ graph for a conductor is shown in the figure. The average current through the conductor in the interval $0$ to $15 \, s$ is ............ $A$.

If an electron revolves in a circular path of radius $0.5 \times 10^{-10} \ m$ at a frequency of $5 \times 10^{15} \ Hz$,the electric current in the circle is .................. $mA$. (Charge of an electron $= 1.6 \times 10^{-19} \ C$)

Define $1 \ Coulomb$ in terms of $1 \ Ampere$.

In a conducting region, $10^{19}$ electrons and $10^{19}$ protons move to the left, while $10^{19}$ $\alpha$-particles move to the right per second. The resulting electric current is $(e = 1.6 \times 10^{-19} \text{ C})$

Number of electrons flowing per second in a conductor carrying a current of $9 \,A$ is

The electric current in a wire varies with time as $i = (2 + 3t) \text{ A}$. Calculate the charge that passes through the cross-section of the wire in $10 \text{ s}$.