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प्रश्न
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?
संख्यात्मक
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उत्तर
Given, q1 = 2 × 10−7 C, q2 = 3 × 10−7 C and
r = 30 cm = 0.3 m, F = ?
F = `1/(4piε_0) * ("q"_1"q"_2)/"r"^2`
= `9 xx 10^9 xx (2 xx 10^-7 xx 3 xx 10^-7)/(0.3)^2`
= 6 × 10-3 N (repulsive in nature, as the two charges are like charges.)
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