390 prompts matching "Assuming a machine can be one hundred per cent efficient"
Quiz: The field pattern of a solenoid and how it resembles a bar magnet
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Spot my mistake: A solution that confuses field strength with flux
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Quiz: Fleming's left-hand rule and the direction of force
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Spot my mistake: A solution using the wrong hand rule for an induced current
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Quiz: Peak value, root-mean-square value and their relationship
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Spot my mistake: A calculation that uses peak current where r.m.s. was required
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Quiz: Capacitive reactance and how frequency changes it
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Spot my mistake: Adding resistance and reactance arithmetically instead of vectorially
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Quiz: Ground state, excited state and ionisation
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Spot my mistake: A solution that uses the wrong sign for a transition energy
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Quiz: Threshold frequency and work function
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Spot my mistake: A solution that treats light purely as a wave here
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Quiz: De Broglie's hypothesis and the matter wave
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Spot my mistake: A calculation using the wrong mass in the de Broglie formula
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Quiz: Intrinsic and extrinsic semiconductors
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Spot my mistake: A circuit drawn with a diode the wrong way round
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Quiz: Uplink and downlink frequencies
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Quiz: Rapid recall across a.c. circuits
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Spot my mistake: The errors that recur across field and circuit calculations
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Quiz: The electron gun and the deflecting plates
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