Q.

The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio

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a

1 : 2

b

2 : 1

c

3 : 5

d

5 : 3

answer is B.

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Detailed Solution

g'g=M'M×R2R'2=12×41=21
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