A bulb's filament is

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A metal case

Metal tip at the centre of the base

Two thick wires

A thin wire

answer is D.

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Detailed Solution

A bulb’s filament is a thin wire.
Tungsten filaments are used in incandescent light bulbs. When an electric current is passed through the filament, it lights. It is also known as the vacuum tube's electron emitting element. To increase the light output of the bulb, the filament is typically made of coils of tiny wire, also known as the coiled coil.

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