Question

when the broken filament of an electric bulb is joined and worked again,the brightness increases.what is the reason?​

Answer 1

Explanation:

The brigthtness will be brighter, usually for a short time, until the filament fails, because of over-voltage, as the rejoined filament is shorter as the applied voltage is still the same.

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Answer 2

Answer:

When the wire is rejoined, the resistance increases.

Because V=IR,

Voltage also increases.

Therefore, the intensity of the light increases.