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in Physics by (349 points)
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Two spheres of radius 10 cm and 40 cm have the same volume density change. Find the ratio of change on them.

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Best 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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