A negatively-charged rod is held near to, but not touching, an uncharged metal sphere.
The sphere is briefly now connected to earth.
The rod is then removed.
Which statement about the charge remaining on the sphere is correct?
It is charged positively because negative charges have moved from the sphere to earth.
It is charged positively because positive charges have moved from earth to the sphere.
It is charged negatively because negative charges have moved from earth to the sphere.
It is charged negatively because positive charges have moved from the sphere to earth.
145 exam-style questions on CIE IGCSE Physics 4.2.1a Positive and negative charge. Each one has a worked solution and a mark scheme showing where the marks go.