Physics
Siphon will fail to work if:

The temperature of the liquids in the two vessels are the same.
The densities of the liquid in the two vessels are equal.
The level of the liquid in the two vessels are at the same height.
Both its limbs are of unequal length.

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Physics
In a conductor

The forbidden energy gap is very narrow
The valence band and the conduction band overlap each other
There is no conduction band
The forbidden energy gap is very wide

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