Electromagnets — GCSE Physics Revision
Revise Electromagnets for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Motor EffectWhat is Electromagnets?
An electromagnet is a temporary magnet made by passing an electric current through a coil of wire. The magnetic field can be turned on and off with the current. The strength of the electromagnet can be increased by increasing the current, increasing the number of turns on the coil, or by adding a soft iron core inside the coil.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The factors affecting the strength of an electromagnet are a common exam topic.
Step-by-step explanationWorked example
You have a coil of wire wrapped around a nail. How can you make it a stronger electromagnet? Solution: You can increase the number of coils of wire around the nail, increase the current flowing through the wire by increasing the voltage of the power supply, or ensure the nail is made of soft iron to act as a core.
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Common mistakes
- 1Forgetting that an electromagnet is temporary. The magnetic field disappears when the current is turned off.
- 2Confusing the factors that affect the strength of the electromagnet. More turns, more current, and an iron core all make it stronger.
- 3Not knowing the right-hand grip rule. This rule helps you determine the direction of the magnetic field (your thumb points in the direction of the north pole when your fingers curl in the direction of the current).
Electromagnets exam questions
Exam-style questions for Electromagnets with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Electromagnets
Core concept
An electromagnet is a temporary magnet made by passing an electric current through a coil of wire. The magnetic field can be turned on and off with the current. The strength of the electromagnet can b…
Frequently asked questions
What are electromagnets used for?
Electromagnets are used in many devices, including scrapyard cranes (to pick up and drop cars), electric bells, relays, and circuit breakers.
How do you find the direction of the magnetic field in an electromagnet?
You can use the right-hand grip rule. If you imagine gripping the coil with your right hand so that your fingers point in the direction of the conventional current, your thumb will point towards the north pole of the electromagnet.