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

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Question : 3

Total: 30

What is the force between two small charges of 2×10−7C and 3×10−7C placed 30‌cm apart in air?

Solution:

F‌=‌

kq1q2

r2

‌=‌

9×109×2×10−7×3×10−7

(30×10−2)2

‌=6×10−3N

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