The wire XY shown in the diagram is connected to a sensitive voltmeter with a centre zero. XY is then moved quickly once through the magnetic field.
What is observed on the voltmeter?
The needle moves briefly in one direction and then returns to the centre.
2 )
The needle moves quickly in one direction and stays deflected.
3 )
The needle vibrates rapidly from side to side whilst XY is moving.
4 )
The needle stays still.
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