$\begin {array} {1 1} (a)\;\text{Zero} \\ (b)\;1.5 \times 10^{-10}A\text{ and perpendicular to conduction current} \\ (c)\;1.5 \times 10^{-10} \text{ and same direction as conduction current} \\ (d)\;1.5 \times 10^{-8} \text{ and opposite direction to that of conduction current} \end {array}$