250 prompts matching "A half-paper drawn from the magnetic field and a.c. topics"
Practice set: Refraction of light and the change of speed between media
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Quiz: Defects of vision and the lenses that correct them
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Quiz: Radio waves and microwaves and their uses
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Physics at work: The range of human hearing, and ultrasound beyond it
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Quiz: Vibration in strings and the factors affecting the frequency
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Practice set: Overtones, harmonics and the quality of a note
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Practice set: Cohesion, adhesion and the forces between molecules
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Worked example: Magnetic induction and how it works
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Spot my mistake: Magnetic screening and how it is achieved
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Spot my mistake: Magnetic flux and magnetic flux density
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Worked example: Calculating charge from current and time
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Quiz: Potential difference, and how it differs from e.m.f.
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Practice set: Internal resistance and the lost volts
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Worked example: Calculating resistance from voltage and current
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Practice set: The ohmic conductor and the non-ohmic conductor
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Quiz: The fuse and how it protects a circuit
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Practice set: The circuit breaker and how it works
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Spot my mistake: Overloading a socket, and what follows from it
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Practice set: The electric bell and how it operates
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Physics at work: The loudspeaker, and how it turns current into sound
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