Question

Infinite charges are lying at $x=1,2,4,\mathrm{8...}$ meter on $X$-axis and the value of each charge is $Q$. The value of intensity of electric field at point $x=0$ due to these charges will be respectively

• A. $12\times {10}^{8}QN/C$
• B. $zero$
• C. $69\times {10}^{9}QN/C$
• D. $4\times {10}^{9}QN/C$

Answer 1

The correct option is A $12\times {10}^{8}QN/C$

Infinite charges are lying at $x=1,2,4,8,....$ metre $x-$axis and the value of each charge $=Q$

The value of intensity of electric field at point $x=0$

These charges will be $E=q\times d$

$=1.6\times {10}^{-19}\times {10}^{28}\times 8\times 12$

$=12\times {10}^{8}QN/C$