Question

A plot of gravitational field v/s distance for a solid sphere of radius R, follows a straight line graph for certain range of distance. The field was determined for

• A. at the centre of the sphere
• B. r = 0 to r = R
• C. r = R to r = Infinity
• D. a point on the surface

Answer 1

The correct option is B r = 0 to r = R

The field is found to increase from r =0 to r = R and at r =R, the field is maximum. The field starts reducing from r = R to infinity and becomes zero at r = infinity
A straight line plot indicates the field is increasing and this is observed for the region between r=0 to r=R
The correct option is (b)