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The earth attracts the moon with a gravitational force of $10^{20} N$ . Then the moon attracts the earth with a gravitational force of__

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10^{- 20} N

10^{2} N

10^{20} N

10^{10} N

answer is C.

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Detailed Solution

The earth attracts the moon with a gravitational force of

10^{20} N

. Then the moon attracts the earth with a gravitational force of

10^{20} N

.
“The universal gravitational law states that attractive force between two bodies of mass

m_{1}

and

m_{2}

which are kept at a distance

d

from each other is directly proportional to the product of masses and it is inversely proportional to the square of the distance in which they are kept.”
i.e.,

F α m_{1} m_{2}

and

F α \frac{1}{d^{2}}

or, combining these, we may write,

F = G \frac{m_{1} m_{2}}{d^{2}}

where

G

is the gravitational constant.
When the earth attracts the moon with a force, the moon attracts the earth with the same gravitational force.

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