1.

Two spheres of radius 10 cm and 40 cm have the same volume density change. Find the ratio of change on them.

Answer»

In this question there is no consideration of volume density change, we have only to use formulae σ=q/a
and also a= 4
πr 2
r1=10cm
r2=40cm
According to equation 
q1/q2=r22 /r12

Thus

q1/q2= (40x40)/(10x10)
q1/q2=16/1
 

Ratio of charges is 16:1



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