GENERATORS
2 marks · NormalA straight wire is moved rapidly across a uniform magnetic field. State what is induced in the wire and explain how you could increase the size of this effect.
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A voltage (or current if complete circuit) is induced; the size can be increased by moving the wire faster, increasing the strength of the magnet, or using a coil instead of a single wire.
Also accept: A voltage is induced in the wire; to increase it, move the wire more quickly, use a stronger magnet, or use a coil.
Common mistakes: Just stating 'current is induced' without mentioning voltage or without required explanation; Giving only one factor
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Marking points
B1 · 1 mark · States that voltage is induced OR current is induced if circuit is complete
B2 · 1 mark · States any correct way to increase induced voltage (move wire faster, stronger magnet, or use a coil).
Worked solution
A voltage is induced in the wire (a current if there is a complete circuit). The induced voltage can be increased by moving the wire quicker, using a stronger magnet, or replacing the single wire by a coil.