$(a)\;6\times10^4\;m\qquad(b)\;3\times10^4\;m\qquad(c)\;6\times10^3\;m\qquad(d)\;2\times10^4\;m$

Want to ask us a question? Click here

Browse Questions

Ad |

0 votes

0 votes

- The SI unit of quantity of electric charge is the coulomb, which is equivalent to about $6.242 \times 10^{18}$ e (e is the charge of a proton). Hence, the charge of an electron is approximately $−1.602 \times 10^{−19}$ C.

Answer : (c) $6\;\times10^3\;m$

Explanation : $\;\large\frac{9\times10^9\times1\times1}{r^2} = 25\times10\quad\;(\large\frac{Rq_{1}q_{2}}{r^2}=mg)$

$r=\large\frac{3}{5}\times10^4=0.6\times10^4\;m\;.$

Ask Question

Take Test

x

JEE MAIN, CBSE, AIPMT Mobile and Tablet App

The ultimate mobile app to help you crack your examinations

...