First slide

Electrostatic force

Question

Two electrons are separated by a distance of $1 \overset{\circ}{A}$ . What is the coulomb force between them

Easy

A

$2 .3 \times 10^{- 8} N$
B

$4 .6 \times 10^{- 8} N$
C

$1 .5 \times 10^{- 8} N$
D

None of these

Solution

$F = 9 \times 10^{9} \times \frac{Q^{2}}{r^{2}} = 9 \times 19^{9} \times \frac{{(1 .6 \times 10^{- 19})}^{2}}{{(10^{- 10})}^{2}} = 2 .3 \times 10^{- 8} N$

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