Question
A solid non-conducting sphere of radius R carries a
uniform volume charge density ρ. What is the ratio of electric field at r = R (surface) to that at r = R/2 (inside)?Solution
We are given:
- A solid non-conducting sphere of radius R
- It carries a uniform volume charge density ρ
- We are to find the ratio of electric field at r = R (on surface) to that at r = R/2 (inside)
The electric field at the surface is twice that at r = R/2 .
- A number is first increased by 20% and then decreased by 20%. The overall change in number is:
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