1(vi)
A coil wound around a piece of soft iron can become an electromagnet only when:
- (a)the circuit is open.
- (b)a magnetic compass is present in the vicinity.
- (c)a galvanometer is connected to the circuit.
- (d)a current flows in the circuit.
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a current flows in the circuit.
Reason — When the current flows through the soft iron piece in the form of a closed ring, it becomes magnetised.