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
3 Likes
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.
Answered By
2 Likes
Related Questions
The heat capacity of a milk cooker is 450 JK-1. Calculate the rise in the temperature when it absorbs 9000 J of heat.
A ray of light PQ is incident normally on the face AB of an equilateral prism. The ray gets totally reflected from the surface AC.
Calculate:
(a) the angle of deviation at AC.
(b) the angle of incidence at BC.
Define background radiation. Give one internal source of this radiation.
Astatine (At) is a radioactive element. Study the graph given below showing the number of protons vs the number of neutrons of radioactive nuclei.
(a) Identify the mass number of the nucleus Astatine (At).
(b) Which line on the graph (l, m, n, or q) will never pass through the position of the daughter nuclei, regardless of any number of α, β, or γ emissions?
(c) Give a reason for your choice in (b).