Q

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

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

• Option 1)

drift velocity

• Option 2)

electric field

• Option 3)

current density

• Option 4)

current

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As we discussed in

Potential Difference -

$\dpi{100} V_{B}-V_{A}=\frac{w}{q}$

-

$J=\frac{I}{A}\:\:=I=JA$

i.e it is clear that when an area increases the current density decreases so the number of flow of electrons will be same thus the current will be constant.

Option 1)

drift velocity

This option is incorrect.

Option 2)

electric field

This option is incorrect.

Option 3)

current density

This option is incorrect.

Option 4)

current

This option is correct.

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