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Magnetic Fields

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Poles of a magnet - Magnetic fields - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

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Learn about and revise magnets, magnetic poles, magnetic fields, permanent and induced magnets with GCSE Bitesize Physics.

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Electromagnets

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Electromagnetic Induction [higher]

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a coil of wire is moved in a magnetic field

a magnet is moved into a coil of wire

The induced voltage produces an induced current if the conductor is connected in a complete circuit. As with all currents, the induced current creates a magnetic field around itself. Note that this magnetic field opposes the original change. For example, if a magnet is moved into a coil of wire, the induced magnetic field tends to repel the magnet back out of the coil. This effect occurs whether a magnet is moved into a coil, or a coil is moved around a magnet.

Factors affecting the induced potential

The direction of the induced potential difference or induced current depends on the direction of movement. The current is reversed when:

the magnet is moved out of the coil

the other pole of the magnet is moved into the coil

The images illustrate how this works.

An induced potential difference or induced current will increase if:

the speed of movement is increased

the magnetic field strength is increased

the number of turns on the coil is increased

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Induced potential and the generator effect - Electromagnetic induction - Higher - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

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a coil of wire is moved in a magnetic field a magnet is moved into a coil of wire The induced voltage produces an induced current if the conductor is connected in a complete circuit. As with all currents, the induced current creates a magnetic field around itself.

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Transformers [higher]

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Design and use of transformers - Transformers - Higher - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

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Learn about and revise transformer function and design, the transformer equation, and power calculations in transformers with GCSE Bitesize Physics.

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Sample Exam Questions

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Magnetism and electromagnetism - Multiple choice questions - Sample exam questions - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

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Learn about and revise Magnetism and Electromagnetism exam questions with GCSE Bitesize Physics.

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Magnetic Fields

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Poles of a magnet - Magnetic fields - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

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Learn about and revise magnets, magnetic poles, magnetic fields, permanent and induced magnets with GCSE Bitesize Combined Science.

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Electromagnets & Transformers

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What is an electromagnet? - Electromagnets and transformers - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

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Learn about and revise electromagnetism, the motor effect and its applications in motors and transformers with GCSE Bitesize Combined Science.

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Sample Exam Questions

# data[].attributes.attachment_link.title
Magnetism and electromagnetism - Multiple choice questions - Sample exam questions - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise Magnetism and Electromagnetism exam questions with GCSE Bitesize Combined Science.