Questions
An electric current flows along an insulated strip PQ of a metallic conductor. The current density in the strip varies as shown in the graph. Which one of the following statements could explain this variation?
detailed solution
Correct option is A
The current density at P is higher than at Q.For the same current flowing through the metallic conductor PQ, the cross-sectional area at P is narrower than at Q.The resistance per unit length r is given by r=ρA where ρ is the resistivity and A is the cross-section area of the conductor PQ. Thus, r is inversely proportional to the cross-sectional area A of the conductor.Talk to our academic expert!
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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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