Electromagnets
Quiz by Oak National Academy: KS3 Science (2)
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6 questions
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- Q1Which of the following would not cause a compass needle to deflect?a copper wire carrying currentan electrostatically charged plastic ruleran iron rodEarth's magnetic field30s
- Q2Which of the following is not needed to make a strong electromagnet?a power supplypaperclipsan iron rodinsulated wire30s
- Q3Why do paper clips fall off the electromagnet when the current is turned off?The magnetism has returned to the power pack.The wire has overheated.There is no current in the coil.The paperclips repel the core.30s
- Q4Which of the following changes will not make an electromagnet stronger?Increasing the number of turns in the coil.Increasing the number of paperclips.Increasing the current in the wire.Increasing the voltage across the wire.30s
- Q5Which of the following will increase the strength of the magnetic field in a coil of insulated wire?Increasing the diameter of the coil.Putting a copper core in the coil.Increasing the resistance of the wire in the coil.Putting an iron core in the coil.30s
- Q6What is the shape of the magnetic field lines caused by a straight, current–carrying wire?straight and away from the wirecircular around the wirestraight and in the same direction as the wirespherical around the wire30s
