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Q.

Suppose the law of gravitational attraction suddenly changes and becomes an inverse cube law i.e.  F∝1/r3, but still remaining a central force. Then

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a

Kepler's law of areas still holds

b

Kepler's law of period still holds

c

Kepler's law of areas and period still hold

d

Neither the law of areas, nor the law of period still holds

answer is D.

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Detailed Solution

F=GMmr3 mv2r=GMmr3 v=GMr2=GMr T=2πrV=2πrGMr=2πr2GM T2=4π2r4GM Both the kepler  laws does not hold good
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