A steady current flows through the conductor of variable cross-sectional area. Now select the correct options.

Options

A. The value of current is same through the cross sections 1,2, and 3
B. The current density is the maximum at the cross sections 3
C. The drift velocity is greater at the cross-section 1
D. The electric field is maximum at the cross section 3.

Answer

A, B, D

Explanation

`I=nAv_(d)e`
`v_(d)=(I)/(nAe)`
We know for a conductor during the flow of steady current,
`E=(v)/(e)=(Ri)/(l)`
`E=(eli)/(Axxl)=(ei)/(A)`
`therefore` electric field is maximum at cross-section (3)