What is the force between two small charges of 2 \times 10^{-7} {\C} and 3 \times 10^{-7} {\C} placed 30 {\cm} apart in air?

CBSE Class 12 Physics 2014 Outside Delhi Set 1 Paper

Question : 3 of 30

Marks: +1, -0

What is the force between two small charges of

2 × 10^{-7} {\C}

and

3 × 10^{-7} {\C}

placed

30 {\cm}

apart in air?

Solution:

F\;=\;{k q_1 q_2}/{r^2}

\;=\;{9 × 10^9 × 2 × 10^{-7} × 3 × 10^{-7}}/{ (30 × 10^{-2}) ^2}

\;=6 × 10^{-3} {\N}

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