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A potential difference, applied between the ends of a conductor of uniform radius 2 mm, results in an electric field 300 V/m along the length of conductor. If current in the conductor is 4 A, resistivity of the material of conductor is nearly :
detailed solution
Correct option is C
J=σE=1ρE ⇒ρ=EAl=Eπr2lTalk to our academic expert!
Similar Questions
Electrons emerge from an electron accelerator as a beam having a circular cross-section of diameter 3 mm. The beam current is 6 μA and electrons are travelling so fast that their speed can be taken as m/sec with an insignificant error. Electron density in the beam is :
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