Physics
The figure below shows a bicycle dynamo which is fitted to the tyre. When the wheels of the bicycle rotate, the spindle of dynamo attached to magnets rotate and the bulb glows.
(a) Name the phenomenon that takes place when the bulb glows while the person rides the bicycle.
(b) What will be the effect on the brightness of the bulb when the rider increases the speed of the bicycle?
Electro-Magnetism
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Answer
(a) Electromagnetic Induction.
(b) When the rider increases the speed of the bicycle then the speed of rotation of the spindle attached to magnets also increases which in turn increases the rate of change of magnetic flux through the coil and hence, induces a greater current.
So, brightness of the bulb increases.
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