The charge on a capacitor plate in a circuit,as a function of time,is shown in the figure. What is the value of current at $t = 4 \, s$ ? ............... $\mu A$

$5 \, A$ of current is passed through a metallic conductor. The charge flowing in one minute in coulombs will be:

Identify the set in which all the three materials are good conductors of electricity.

An electron (charge $= 1.6 \times 10^{-19} \text{ C}$) is moving in a circle of radius $5.1 \times 10^{-11} \text{ m}$ at a frequency of $6.8 \times 10^{15} \text{ rev/s}$. The equivalent current is approximately:

$A$ steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is/are:

$A$ steady current is flowing in a metallic conductor of non-uniform cross-section. The physical quantity which remains constant is