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Standard XII
Physics
NCERT
Question

Sushant wins a hand-powered flashlight as a prize in a science fair. The flashlight has a clear plastic case, so he can look inside to see how it works. When he presses the handle, a grey ring spins between two coils of wire. The ends of the wire are connected to the light bulb. So, when he presses the handle, the light bulb glows.
Explain how an electric current is produced to light the bulb.

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Solution
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An electric current is produced to light the bulb by using electromagnetic induction.

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Similar Questions
Q1
Sushant wins a hand-powered flashlight as a prize in a science fair. The flashlight has a clear plastic case, so he can look inside to see how it works. When he presses the handle, a grey ring spins between two coils of wire. The ends of the wire are connected to the light bulb. So, when he presses the handle, the light bulb glows.
Explain how an electric current is produced to light the bulb.
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Q2

Question 3

In an electric bulb, light is produced due to the glowing of

(a) the glass case of the bulb.

(b) the thin filament.

(c) the thick wires supporting the filament.

(d) gases inside the glass case of the bulb.

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Q3
A loop of metal wire containing a tiny light bulb is attached to an insulating handle and placed over a coil of wire in which a current can be established by a source of emf and controlled by a variable resistor. Both loop and the coil is in the same plane. Find out the option which could NOT cause the bulb to light?
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Q4
A bulb of 22 Ω is producing light when connected to a 220 V supply. What is the electric power of the bulb?
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Q5
Kushagra has made the following arrangement for his school project, in which he has to light the bulb. The bulb will not glow if the ends A and B are connected with:


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