Some students observe that a hollow metal sphere hanging on an insulating string is attracted to a positively charged rod. they decide that this is evidence that the sphere could also be charged. the answer to which of the following questions might determine whether they are correct?- is the sphere still attracted when the positively charged rod is place on the other side of the sphere?- is the sphere repelled by a negatively charged rod?- is the attraction of the sphere to the rod weaker the distance between them is increased?- is the attraction of the sphere to the rod stronger when the charge on the rod is doubled?