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Question: Two electrons are separated by a distance of 1Å. What is the coulomb force between them...

Two electrons are separated by a distance of 1Å. What is the coulomb force between them

A

2.3×10−82.3 \times 10^{- 8}N

B

4.6×10−84.6 \times 10^{- 8}N

C

1.5×10−81.5 \times 10^{- 8}N

D

None of these

Answer

2.3×10−82.3 \times 10^{- 8}N

Explanation

Solution

F=9×109×Q2r2=9×199×(1.6×10−19)2(10−10)2=2.3×10−8NF = 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