Two identical blocks of mass m are suspe...

Two identical blocks of mass m are suspended from a beam balance whose scale pans differ in vertical height by `h(h< < R)`, if R and `rho` are the radius and density of the earth, then the error in weighing is

`2/3 pi rho R^(3) Gm`

`8/3 pi rho G mh`

`8/3 pi rho R^(3) Gm`

`4/3 pi rho Gm^(2) h`

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