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If gravitational constant is decreasing with time, what will remain unchanged in case of a satellite orbiting around the earth?

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If gravitational constant is decreasing with time, what will remain unchanged in case of a satellite orbiting around the earth?

(a) Time period

(b) Orbiting radius

(c) Areal velocity

(d) Angular velocity
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The correct option is (c) Areal velocity

The explanation is: The central gravitational force decreases which does not exert any torque. Hence the angular momentum and consequently areal velocity remain unchanged.
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