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Q.

Sahil made the following experimental set up by using a copper wire

Question Image

He repeated this experiment with
I) Aluminium foil         II) Iron nail             III) Coal         IV) Graphite
In which cases, the bulb will glow ?

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An Intiative by Sri Chaitanya

a

I and II

b

III and IV

c

I, II and IV

d

All of the above

answer is C.

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Detailed Solution

Due to free electrons present in graphite, it conducts electricity along with metals.

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