Question

7. At any point P on earth surface the value of acceleration due to gravity is g. If the earth suddenly shrinks to half of its radius then, value of acceleration due to gravity at the same point P is (1) 4 9 g (2) 4 g (3) 9 g (4) g

Answer 1

That would be the second option..that is it would become 4 times it's original value.Want me to give a detailed explanation?:)