Question

an electron moves in a circle of radius 10cm with a constant speed of 4 X 10 raised to power 6 meter per second. Find the electric current at a point on the circle.

Answer 1

Given, r = 10 cm = 0.1 m
v = 4 X 10^​6 m/s
As, T = $\frac{2\pi r}{v}$ = $\frac{2\pi \times 0.10}{4\times {10}^6}s$

$$\begin{gathered} \nu =\frac{1}{T}=\frac{4\times {10}^6}{2\pi \times 0.10}{s}^{-1} \\ as,I=\nu e=\frac{4\times {10}^6\times 1.6\times {10}^{-19}}{2\pi \times 0.10}=1.02\times {10}^{-12}A \end{gathered}$$