Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is :

electric field

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current density

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current

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drift velocity

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Solution

The correct option is B. current.
Current density remains constant along a non uniform cross sectional conductor as its expression is = $n e v_{d}$ ,
where,
n = number of electrons
e = electronic charge
$v_{d}$ = drift velocity
And this expression is independent of cross sectional area.

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[IIT-JEE 1997]

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Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is :

The correct option is B. current.Current density remains constant along a non uniform cross sectional conductor as its expression is = nevd,where, n = number of electrons e = electronic charge vd= drift velocity And this expression is independent of cross sectional area.

The correct option is B. current.
Current density remains constant along a non uniform cross sectional conductor as its expression is = $n e v_{d}$ ,
where,
n = number of electrons
e = electronic charge
$v_{d}$ = drift velocity
And this expression is independent of cross sectional area.