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 $t = 4 \, s$ ? ............... $\mu A$

What is the direction of electric current inside an electrolyte?

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

Due to what is current formed in conductors?

Given a current-carrying wire of non-uniform cross-section,which of the following is constant throughout the length of the wire?

In a hydrogen discharge tube,it is observed that through a given cross-section,$3.13 \times 10^{15}$ electrons are moving from right to left and $3.12 \times 10^{15}$ protons are moving from left to right per second. What is the electric current in the discharge tube and what is its direction?