Question

Two hollow concentric spheres have masses M & 2M. There radii are R and 2R as shown in Fig. The graph showhing variation of intensity of gravitational field with x is

Answer 1

Correct option is (1)

(i) For points 0 < x < R; the points are inside both hollow spheres, the intensity of gravitational field due to each sphere is zero. 

(ii) For points R < x < 2R, the points are outside inner sphere but inside outer sphere. The intensity I₁ due to inner sphere various as 1/x² . The intensity I₂ due to outer sphere is zero. At point on the inner surface of outer sphere; the resultant intensity I is

However for point on outer surface of outer sphere the intensity I is