Question

Two neutral conducting spheres are kept next to each other and touching each other. They are also separated from the table with an insulating stand.
Then, a negatively charged rod is brought near, but not touching, sphere $A$. The two spheres are then separated by touching only their insulating base. Finally, the charged rod is removed.
What are the charges of sphere $A$ and sphere $B$?

• A. Sphere A is positive while sphere B is negative
• B. Sphere A is negative while sphere B is positive
• C. Both spheres are positively charged
• D. Both spheres are negatively charged

Answer 1

The correct option is A Sphere A is positive while sphere B is negative

When negatively charged rod is brought near the two spheres, the positive charges attract towards the rod, or in other sense, collect in sphere A.

Similarly the electrons from sphere A move towards the sphere B, away from the rod.

When the two spheres are separated and the rod is removed, resultantly the sphere A retains positive charge and sphere B retains negative charge.