Question

What will happen if i plug line tester in socket whem power is swithed off?

Answer 1

When you test the line using a tester, its neon lamp glows because of voltage between your body (at ground potential) and the potential of the live point being tested. On a plug, one point is live, while the othet is neutral.

Answer 2

Hii

you are welcome in my ans

the current is flow due to change in potential difference provided by our body due to which bulb glow .

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Hope it may helps you