Question

Figure shows a negatively charged ebonite rod A which is brought near an uncharged metal sphere P touching the other uncharged metal sphere Q. Both the spheres P and Q stand on separate insulating stands. Rod A is removed first and then sphere Q is removed by holding the insulating stand of it. What kind of charges will then be on the spheres P and Q ?

• A. both have positive
• B. both have negative
• C. P has
• D. No charge on either spheres

Answer 1

The correct option is D No charge on either spheres

When a negatively charged ebonite rod A which is brought near an uncharged metal sphere P touching the other uncharged metal sphere Q, both the spheres P and Q has the same negative charge.
Now, when the Rod A is removed first and then sphere Q is removed by holding the insulating stand of it, none of the spheres has any charge because electrons redistribute themselves as soon as the rod A is removed and both the spheres regain their original uncharged condition.
Hence, there is no charge on both the spheres P and Q.