A small mass m is moved slowly from the surface of the earth to a height h above the surface. The work done (by an external agent) in doing this is (a) mgh, for all values of h (b)mgh , for h lt lt R (c) 1/2mgR, for h=R (d)-1/2mgR, for h=R

A small mass m is moved slowly from the surface of the earth to a heig

1.	A small mass m is moved slowly from the surface of the earth to a height h above the surface. The work done (by an external agent) in doing this is (a) mgh, for all values of h (b)mgh , for h lt lt R (c) 1/2mgR, for h=R (d)-1/2mgR, for h=R
Answer» only a & B are true only b & C are true only a & d are true All are true Answer :B