STANDARDPhysics-Electrostatics
STANDARD Physics Coulomb's Law MCQ Question
Type: MCQ-conceptual-Medium
Two small identical spheres, each of mass 1 g and carrying same charge 10⁻⁹ are suspended by threads of equal lengths. If the distance between the centres of the spheres is 0.3 cm in equilibrium then the inclination of the thread with the vertical will be :-
A
tan⁻¹(0.1)
B
tan⁻¹(2)
C
tan⁻¹(1.5)
D
tan⁻¹(0.6)
Correct Answer
Option A
Detailed Explanation
The forces acting on the spheres are gravitational force and electrostatic force. By balancing these forces and using trigonometric identities, we find tan θ = qE/mg = 0.1, thus θ = tan⁻¹(0.1).
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