Physics-Coulomb's Law
NEET Physics Coulomb's Law MCQ Question
Type: MCQ-numerical-Hard-Class 12
Two identical metal spheres A and B have charges +8µC and -2µC respectively. They are brought into contact and then separated by a distance of 10 cm. What is the magnitude of the electrostatic force between them after separation?
A
5.76 N
B
8.64 N
C
88 N
D
11.52 N
Correct Answer
Option A
Detailed Explanation
When spheres A and B are brought into contact, the charges redistribute equally due to symmetry. Each sphere ends up with a charge of +3µC. Using Coulomb's law with r = 0.1 m, the force is computed as F = (1/(4πε₀)) * (3µC * 3µC) / (0.1 m)² = 5.76 N.
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