If the speed of rotation of earth increases from existing speed, then the weight of a body is ...... 

Options

A. increases at an equator and remain unchanged at pole.
B. decreases at an equator and remain unchanged at poles.
C. remains unchanged at an equator but decreases at poles.
D. remains unchanged at an equator but increases at poles.

Answer

B

Explanation

`implies` At equator `g=g- Romega^2 cos lamda`
here `lamda=0`
`:.g. = g - Romega^2`
`:.` Angular speed increase, g. decreases
At poles `lamda = 90^@`
`:.g. = g `
`:.g.` remains constant