Two circular coils \( P \) and \( Q \) are fixed coaxially and carry currents \( I_{1} \) and \(...

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Two circular coils \( P \) and \( Q \) are fixed coaxially and carry currents \( I_{1} \) and \( I_{2} \) respectively
(a) If \( I_{2}=0 \) and \( P \) moves towards \( Q \), a current in the same direction as \( I_{1} \) is induced in \( Q \).
(b) If \( I_{1}=0 \) and \( Q \) moves towards \( P \), a current in the opposite direction to that of \( I_{2} \) is induced in \( P \).
(c) When \( I_{1} \neq 0 \) and \( I_{2} \neq 0 \) are in the same direction then the two coils tend to move apart.
(d) When \( I_{1} \neq 0 \) and \( I_{2} \neq 0 \) are in opposite directions then the coils tends to move apart.
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