Near one end of an electrically neutral aluminum rod lying on a table made of nonconducting material, you hold a comb that is also made of a nonconducting material but carries a positive charge (Figure P22.23). Does a small steel sphere located near the other end of the rod roll toward the rod, roll away from the rod, or stay where it is if the sphere is \((a)\) electrically neutral and \((b)\) positively charged?

Data from Figure P22.23

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