A planet of mass m is moving around a st...

A planet of mass m is moving around a star of mass M and radius R in a circular orbit of radius r. The star abruplly shrinks to half its radius without any loss of mass. What change will be there in the orbit of the planet ?

The planet will escape from the star

The radius of the orbit will increase

The radius of the orbit will decrease

The radius of the orbit will not change

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