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

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

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Physics
A drop of liquid assumes spherical shape because:

Inter molecular forces are weak in liquids
Intermolecular forces are strong in liquids
A sphere has the largest surface area for a given volume
A sphere has the least surface area for a given volume

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