Question

A positively-charged rod is held near to, but not touching, an uncharged metal sphere. The sphere is briefly now connected to earth.

The rod is removed.
Which statement about the charge on the sphere is correct?
A It is charged negatively because negative charges have moved from earth to the sphere.
B It is charged negatively because positive charges have moved from the sphere to earth.
C It is charged positively because negative charges have moved from the sphere to earth.
D It is charged positively because positive charges have moved to earth from the sphere.

Answer 1

A is correct

Step-by-step explanation:

First of all, in the case of earthing, positive charges don't flow (for earthing only). In that case, negative electrons from the earth flow up to the sphere and cancel out the positive charges, making the sphere negatively charged.

Answer 2

I am not 100% sure on this but I think it would be B