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

In a neon discharge tube,$2.9 \times 10^{18}$ $Ne^+$ ions move to the right each second,while $1.2 \times 10^{18}$ electrons move to the left per second. The electron charge is $1.6 \times 10^{-19} \, C$. The current in the discharge tube is:

How is current formed in conductors?

The charge of an electron is $1.6 \times 10^{-19} \ C$. How many electrons strike the screen of a cathode ray tube each second when the beam current is $16 \ mA$?

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:

The electric current flowing through a given conductor varies with time as shown in the graph below. The number of free electrons which flow through a given cross-section of the conductor in the time interval $0 \leq t \leq 20 \ s$ is