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Q.

Choose the force that keeps the atmosphere close to the earth's surface.


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a

Force of gravitation

b

Force of friction

c

Electrostatic force

d

Magnetic force 

answer is A.

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Detailed Solution

Force of gravitation keeps the atmosphere close to the earth’s surface.
Because of the high force of attraction of the earth, escape velocity from the earth is higher for almost all gasses; this is why all gasses are held around the earth; light gasses, such as hydrogen, can stay in the atmosphere because their escape velocity is lower. As a result, we can say that gravity holds the atmosphere together.
 
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