Question

If $1\mu A$ current is flowing in a wire, the number of electrons which pass from one end of the wire to the other end in one second is:

• A. $6.25\times {10}^{12}$
• B. $6.25\times {10}^{15}$
• C. $6.25\times {10}^{18}$
• D. $6.25\times {10}^{19}$

Answer 1

The correct option is A $6.25\times {10}^{12}$

The current is defined as rate of flow of charged particles.
i.e.
i $=\frac{Q}{t}$
here,
$i=1\mu A$
$t=1s$
Hence,
$1\mu A$$=\frac{Q}{1s}$
Hence,
Q $=1\mu C$
Q $=N\times e$
Where N is the number of electrons and e is the electronic charge of value $1.6\times {10}^{-19}C$
N $=\frac{Q}{e}=\frac{1\mu C}{1.6\times {10}^{-19}C}=6.25\times {10}^{12}$