Question

1 Which one of the following object, should be kept in between the free ends of the wire of the given circuit to make the bulb glow- (A) Sulphur A (B) Coal (C). Iron rod (D) Wood ans ​

Answer 1

In this procedure, place an iron nail between the ends of the wire, and the light bulb will illuminate.

Explanation:

• Iron is a metal.
• Metal is a good conductor of electricity, and iron nails are conductors. Not as good as a copper or aluminum or gold or silver item of similar size, but it certainly conducts electricity and is not an isolator.
• If you replace the iron nails with wooden sticks,
• Light bulbs do not light because wood is not a good conductor of electricity.