Question
An electron gun emits $2.0 \times 10^{16}$ electrons per second. What electric current does this correspond to?

Answer

No. of electrons per second = $2 \times 10^{16}$ electrons/ sec. Charge passing per second $=2\times10^{16}\times1.6\times10^{-9}\frac{\text{coulomb}}{\text{sec}}$$=3.2\times10^{-9}$ Coulomb/ sec
Current $=3.2\times10^{-3}\text{A}.$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Two liquids of specific gravity $1.2$ and $0.84$ are poured into the limbs of a U-tube until the difference in levels of their upper surfaces is $9\ cm$. What will be the heights of their respective surfaces above the common surface in U-tube? What is the pressure at the common surface (lg = 10ms?)
An electric current of 2.0A passes through a wire of resistance $25\Omega$. How much heat will be developed in 1minute?
Moon is seen to be of $\Big(\frac{1}{2}\Big)^\circ$ diameter from the earth. What must be the relative size compared to the earth?
Two bodies of specific heats and C, having same heat capacities are combined to form a single composite body. What is the specific heat of the composite body?
Define conservative and non- conservative forces. Give examples of these also
A mercury barometer has a quartz bulb of volume $0.300cm^3$ and a stem of bore 0.0100cm. How far does the indicating thread of mercury move when the temperature changes from $30^\circ C$ to $45^\circ C$? Ignore the small expansion of the quartz bulb. The volume expansivity of mercury is $182 \times 10^{-6}(^\circ C)^{‑1}$.
Can the dispersive power $\omega=\frac{\mu_\text{v}-\mu\text{r}}{\mu-1}$ be negative? What is the sign of co if a hollow prism is immersed into water?
A block suspended from a vertical spring is in equilibrium. Show that the extension of the spring equals the length of an equivalent simple pendulum i.e., a pendulum having frequency same as that of the block.
A tightly-wound, long solenoid has n turns per unit length, a radius r and carries a current i. A particle having charge q and mass m is projected from a point on the axis in a direction perpendicular to the axis. What can be the maximum speed for which the particle does not strike the solenoid ?
A block of mass m is kept on a horizontal table. If the static friction coefficient is $\mu,$ find the frictional force acting on the block.