A straight wire is stationary between the poles of a magnet.
It lies perpendicular to the magnetic field.
Which action does not induce an e.m.f. in the wire?
1 )
moving the magnet up towards the top of the page and the wire down towards the bottom of the page
2 )
moving the magnet up towards the top of the page only
moving the wire and the magnet up towards the top of the page at the same speed
4 )
moving the wire down towards the bottom of the page only
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