Physics
During washing of clothes, we use indigo due to its

High glorious nature
Very low cost
Proper pigmental composition
Better cleaning action

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

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