Two insulating blocks are rubbed together. Block P is left with 5 units of negative charge. Which statement about the two blocks is correct?
Block Q has 5 units of positive charge, so the total charge is unchanged
Block Q has 5 units of negative charge, so the total charge is doubled
Block Q has no charge at all, so the total charge has been increased
Block Q has 10 units of positive charge, so the charges are balanced