Current Electricity and Electrical InstrumentHard
Question
A hollow conducting sphere of inner radius R and outer radius 2R has resistivity ′ρ′ as a function of the distance ′r′ from the centre of the sphere: ρ = kr2/R. The inner and outer surfaces are painted with a pelied between the two surrfectly conducting ′paint ′ and a potential difference ᐃv is appfaces. Then, as ′r′ increases from R to 2R, the electric field inside the sphere-
Options
A.increases
B.decreases
C.remains constant
D.passes through a maxima
Solution
Net resistance is constant so current is constant But j = 
⇒ E = constant.
⇒ E = constant.Create a free account to view solution
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