First slide

Pontial due to

Question

A charge of 10^-9 C is placed on each of the 64 identical drops of radius 2 cm. They are then combined to form a bigger drop. Find its potential.

Moderate

A

7.2 x 10³ V
B

7.2 x 10² V
C

1.44 x 10² V
D

1.44 x 10³ V

Solution

$\begin{array}{rcl} V & = & n^{2 / 3} v \Rightarrow V = (64)^{2 / 3} \times 9 \times 10^{9} \times \frac{10^{- 9}}{(2 \times 10^{- 2})} \\ = & 7.2 \times 10^{3} V \end{array}$

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