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A metallic conductor of irregular corss-...

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`

Text Solution

Verified by Experts

The correct Answer is:
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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