The force between two small charged spheres having charges of \(2\times 10^{-7}~\text{C}\) and \(3\times 10^{-7}~\text{C}\) placed \(30\) cm apart in the air is:
1. \(6 \times 10^{-3}~\text{N}\)
2. \(5 \times 10^{-3}~\text{N}\)
3. \(4 \times 10^{-4}~\text{N}\)
4. \(5 \times 10^{-4}~\text{N}\)
Subtopic:  Coulomb's Law |
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The electrostatic force on a small sphere of charge 0.4 µC due to another small sphere of charge –0.8 µC in the air is 0.2 N. The distance between the two spheres is:

1. 14 cm
2. 12 cm
3. 16 cm
4. 10 cm

Subtopic:  Coulomb's Law |
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Dimensional formula of ke2Gmemp is:
1. [M1L1T1]
2. [M0L1T1]
3. [M0L0T0]
4. [M-1L0T2]

Subtopic:  Coulomb's Law |
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Four point charges \(q_A = 2μ\text{C},\) \(q_{B} = -5μ\text{C},\) \(q_C = 2μ\text{C}\) and \(q_D = -5μ\text{C}\) are located at corners of a square \(ABCD\) of side \(10\) cm. The force on a charge of \(1μ\text{C}\) placed at the centre of the square is:
1. \(2\) N
2. \(1\) N
3. \(5\) N
4. \(0\) N
Subtopic:  Coulomb's Law |
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Two insulated charged copper spheres A and B have their centers separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is  6.5×10-7 C? The radii of A and B are negligible compared to the distance of separation.
1. 1.52 × 10−2 N
2. 3.7 × 10−2 N
3. 2.01 × 10−2 N
4. 2.23 × 10−1 N

Subtopic:  Coulomb's Law |
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