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What should be the length of the metal rod which is used as a lightning conductor?

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No specific length.

Taller than the walls of the building.

Same length as the wall of a building.

Shorter than the walls of the building.

answer is C.

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Detailed Solution

Buildings can be shielded from the effects of lightning using lightning conductors. During construction, a metal rod that is taller than the building is inserted into each of the walls because lightning is drawn to taller targets.

When lighting happens these rods offer a simple pathway for the electric charge to be transmitted to the earth.

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