What is the force between two small charged spheres

Asked by admin @ 11/08/2021 in Physics viewed by 299 People

Question 1.1: What is the force between two small charged spheres having charges of 2 × 10 −7 C and 3 × 10 −7 C placed 30 cm apart in air?

Class 12 - Physics - Electric Charges And Fields Electric Charges And Fields Page-46

Answered by admin @ 11/08/2021

According to Coulombs law,
F = KQ₁Q₂/r²
where , Q₁ and Q₂ are charges and r is the separation between charges .

Given, Q₁ = 2 × 10⁻⁷C
Q₂ = 3 × 10⁻⁷C
r = 30cm = 0.3 m
K = 9 × 10⁹ Nm²/C²
∴ F = 9 × 10⁹ × 2 × 10⁻⁷ × 3 × 10⁻⁷/(0.3)²
= 9 × 10⁹ × 6 × 10⁻¹⁴/0.09
= 6 × 10⁻³N

Hence, force = 6 × 10⁻³ N

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What is the force between two small charged spheres

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