JEE PHYSICS MCQ: CURRENT ELECTRICITY

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The electrical resistance of mercury column in a cyclindrical container is "

R

". The mercury is poured into another cylindrical container with half the radius of cross section. The resistance of the mercury column is

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Correct option: C

16R

Option D (57600 km) is correct because it accurately calculates the height above the Earth's surface where gravity is 1% of its surface value using the inverse square law.

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