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.
452 exam-style questions on CIE IGCSE Physics 4.2 Electrical quantities, covering 4.2.1a Positive and negative charge, 4.2.1b Charging by friction and detecting charge, 4.2.1c Electrical conductors and insulators, 4.2.1d Electric fields and electric field patterns, 4.2.2a Electric current, charge and measuring current, 4.2.2b Conduction in metals and the direction of current, 4.2.2c Direct current and alternating current, 4.2.3a Electromotive force, 4.2.3b Potential difference and voltmeters, 4.2.4a Resistance, 4.2.4b Resistance of a metallic wire, 4.2.4c Current–voltage graphs, and 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.