Filament of a torch bulb is
$(a)$. a metal case
$(b)$. metal tip at the centre of the base
$(c)$. two thick wires
$(d)$. a thin wire.

Academic Physics NCERT Class 6

The filament of a bulb is a thin wire that glows when the current is passed through it.

So, option $(d)$ is correct.

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Updated on: 10-Oct-2022

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