Current Electricity and Electrical InstrumentHard
Question
The current density in a wire is 10 A/cm2 and the electric field in the wire is 5 V/cm. If ρ = resistivity of material, σ = conductivity of the material then (in S.I. units) :
Options
A.ρ = 5 × 10-3
B.ρ = 200
C.σ = 5 × 10-3
D.σ = 200
Solution
IR = V = El ⇒ I 
⇒ 
= 
= 5 × 10-3Ω-m
σ =
= 200 mho/m.
⇒ = = 5 × 10-3Ω-mσ =
= 200 mho/m.Create a free account to view solution
View Solution FreeTopic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
A 5oC rise in temp. is observed in a conductor by passing a current. When the current is doubled the rise in temperature...N identical cells whether joined together in series or in parallel, give the same current, when connected to an external...An energy source will supply a constant current into the load of its internal resistance is...The network shown in figure is a part of a complete circuit. If at a certain instant the current ′i′ is 5 A ...Consider a cylindrical element as shown in the figure. Current flowing the through element is I and resistivity of mater...