Questions
A material of resistivity is formed in the shape of truncated cone of altitude ‘h’ as shown in the fig. the top end has radius ‘a’ while bottom ‘b’. Assuming a uniform current density through any circular cross section of the cone. The resistance between two ends is :
detailed solution
Correct option is B
Effective area of frustum A=A1A2=πa2.πb2=πab Now apply formula of resistance ∴ R=ρhA=ρhπabTalk to our academic expert!
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