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Q.

The angular velocity of rotation of star (of mass M and radius R) at which the matter start to escape from its equator will be

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a

2GM2R

b

2GMg

c

2GMR3

d

2GRM

answer is C.

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Detailed Solution

Escape velocity v=2GMR ⇒If star rotates with angular velocity ω then ω=vR=1R2GMR=2GMR3
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