Question

when a current 2A flows 3micro second in a coper wire estimate the number of electrons crossing the cross section of the wire hint with 2A for 3micro second charge transfere = 6 micro colombs

Answer 1

Answer:

The number of electrons crossing the cross section of wire when a 2A of current flows in 3 micro seconds are $375\times 10^{11}$ electrons

Explanation:

Given that,

              I = 2A

              t = 3$\mu$$s$

We know that,

                   $I = \frac{Q}{t}$

            ⇒    

                $\begin{aligned}\begin{aligned}2=\frac{Q}{3\times 10^{-6}}\\\end{aligned}\end{aligned}$

              $Q=2\times 3\times 10^{-6}=6\times 10^{-6}C$

To find the number of electrons,

We know,

               Q = ne

          ⇒

              $\begin{aligned}6\times 10^{-6}=n\times 1\cdot 6\times 10^{-19}\\n=\frac{6\times 10^{-6}}{1\cdot 6\times 10^{-19}}=375\times 10^{11}electvons\end{aligned}$