An aluminium ring $B$ faces an electromagnet $A$. The current $I$ through $A$ can be altered.
- AWhether $I$ increases or decreases,$B$ will not experience any force.
- BIf $I$ decreases,$A$ will repel $B$.
- CIf $I$ increases,$A$ will attract $B$.
- DIf $I$ increases,$A$ will repel $B$.
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