Edexcel IGCSE Physics 6.15 Induced voltage
Practise predicting induced voltage from motion through magnetic fields, using magnets, coils, rods, meters and changing field strength or speed.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- explain induced voltage when a conductor or coil cuts magnetic field lines
- predict how speed, field strength, turns or wire length changes the induced voltage
- link a reversed motion direction to the sign or direction of the voltmeter reading
6.15 Induced voltage question 1
The diagrams show some equipment that the physicist Ørsted used in an investigation in 1820.
Diagram 1 shows the position of eight compass needles around a wire with no current in the wire.
The compass needles line up with and show the direction of the Earth's magnetic field lines.
Diagram 2 shows the position of the same compass needles when a current is in the wire.
Question (a)
(a)
The power supply in diagram 3 is replaced by an ammeter.
[ 4 ]
Question (i)
(i)
When the wire is moved, a current is detected.
Explain which direction the wire is moved in the magnetic field to produce a current in the wire.
[ 2 ]
Question (ii)
(ii)
Explain why a current is produced in the wire when the wire is moved in the magnetic field.
[ 2 ]
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