Two perfectly insulating spheres charged respectively with Q₁ and Q₂ and with a respective radius of R₁ and R₂ are placed in contact.
What will the charge on the sphere of radius R₁ now be?
A) Q₁
B) Q₂
C) (Q₁R₁² + Q₂R₂²)/(R₁² + R₂²)
D) 0
E) (Q₁R₁ + Q₂R₂)/(R₁ + R₂)
IMAT 2023 · Question 60
Q60 - Electrostatics
Pinned
The correct answer is A) Q₁.
The spheres are perfect insulators, so charge can't move through them and nothing flows from one to the other when they touch. Each keeps the charge it started with: Q₁.
Option E is the answer for conducting spheres, where charge spreads out in proportion to the radii. Insulator versus conductor is the whole point of the question.
Replies 0
No other replies yet.
Log in to reply.