Question

A Positively charged oil droplet remains in the electric field between two horizontal plates separated by a distance 1 cm. If the charge on the drop is $3.2\times {10}^{-19}C$ and the mass of the drople is ${10}^{14}$ the potential difference the plates is

• A. 3125 V
• B. 2532 V
• C. 4978 V
• D. 6162 V

Answer 1

The correct option is A 3125 V

$\begin{array}{c}{F}_E=mg\\ \Rightarrow q\left[\frac{V}{{10}^3}\right]={10}^{-14}\times 10\\ \Rightarrow 3.2\times {10}^{-9}.\left(\frac{V}{{10}^{-2}}\right)={10}^{-13}\\ V=\frac{{10}^{-13}}{3.2\times {10}^{-17}}\\ =\frac{10000}{3.2}\\ =3125V\\ Hence,\\ optionAiscorrectanswer.\end{array}$