Question

Can you please answer this question?

Answer 1

1.pencil is made up of lead outer portion is og wood but inner is of lead and lead conduct electricity basic reason could be circuit completion.

2.bulb might got fused or connection breaks somewhere.these mainly be reason for not glowing of bulb.

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Answer 2

1>the bulb lit up becoz the in a pencil the black rod by which we write is graphite and it is good conducter of electricity.
2> this case is arise when battery is not charged or wires are dangerd by carben.
Hope it helps
धन्यवाद
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