A metallic conductor of irregular corss-section is as shown in the figure. A constant potential difference is applied across the ends `(1)` and `(2)`. Then: A. the current at the cross-section `P`equals the current at the cross-section `Q`B. the electric field intensity at `P` is less than that at `Q`C. the rate of heat generated per unit time at `Q` is generated than that at `P`D. the number of electrons crossing per unit area of cross-section at `P` is less than at `Q`

A metallic conductor of irregular corss-section is as shown in the fig

1.	A metallic conductor of irregular corss-section is as shown in the figure. A constant potential difference is applied across the ends `(1)` and `(2)`. Then: A. the current at the cross-section `P`equals the current at the cross-section `Q`B. the electric field intensity at `P` is less than that at `Q`C. the rate of heat generated per unit time at `Q` is generated than that at `P`D. the number of electrons crossing per unit area of cross-section at `P` is less than at `Q`
Answer» Correct Answer - A::B::C::D `(A) I_(P)=I_(Q)` `(B)J=sigmaE` `J_(P)ltJ_(Q)` `E_(P)ltE_(Q)` (C) `H=I^(2)R & R prop 1/A` `R_(P)ltR_(Q)` `H_(P)ltH_(Q)` (D) For metal `n` is independent of temperature

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