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
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Can be of any shape
Should be made of a good conductor but can be of any shape
Should be in the form of a vertical rod
Should be made of a good conductor like copper with sharp-pointed edges

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