Question

A TV set shoots out a beam of electrons. The beam current is $10A$. How many electrons strike the TV screen in a minute?

• A. 16 x 10¹⁹
• B. 16 x 10^-19
• C. 375 x 10¹⁹
• D. 116 x 10¹⁹

Answer 1

The correct option is C

375 x 10¹⁹

Given, Current, I =10 A

We know that current, $I=\frac{Q}{t}$ = $\frac{ne}{t}$

Where,

I = current,

Q = charge,

n = number of electrons,

t = time,

e = charge of an electron

$10=\frac{n\times 1.6\times {10}^{-19}}{1}$

Number of electrons hitting per second, $n=6.25\times {10}^{19}$

Number of electrons hitting per minute = $n\times 60$ = $3.75\times {10}^{21}$​