NEET2016Physics-Electrostatics
NEET 2016 Physics Coulomb's Law MCQ Question
Type: MCQ-conceptual-Hard-Class 12
Two identical charged spheres suspended from a common point by two massless strings of lengths l, are initially at a distance d (d<< l) apart because of their mutual repulsion. The charges begin to leak from both the spheres at a constant rate. As a result, the spheres approach each other with a velocity v. Then v varies as a function of the distance x between the spheres, as
A
v ∝ x⁻¹/²
B
v ∝ x⁻¹
C
v ∝ x¹/²
D
v ∝ x
Correct Answer
Option A
Detailed Explanation
As the charges leak, the force decreases, leading to a decrease in separation. The velocity is proportional to the square root of the inverse of the distance.
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