Ten one-rupee coins are put on top of each other on a table. Each coin has a mass m. The reaction of the 6th coin (counted from the bottom) on the 7th coin is
A
4 mg
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B
6 mg
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C
7 mg
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D
3 mg
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Solution
The correct option is A 4 mg The sixth coin is under the weight of four coins above it. Hence, Reaction of the 6th coin = Force on the 6th coin due ti 7th coin = 4 mg