A steady current flows in a metallic conductor of non-uniform cross section. The quantity/quantities constant along the length of the conductor is/are
[IIT-JEE 1997]

current, electric field and drift speed

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drift speed only

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current and drift speed

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current only

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Solution

The correct option is D
current only

We know, $I = n e A v_{d}$

The product $A v_{d}$ is constant.
So when A increases by some factor, $v_{d}$ will decrease by the same factor.

So, $n e A v_{d}$ is constnat $\Rightarrow$ I is constant.

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A steady current flows in a metallic conductor of non-uniform cross section. The quantity/quantities constant along the length of the conductor is/are [IIT-JEE 1997]

The correct option is D current only We know, I=neAvd The product Avd is constant. So when A increases by some factor, vd will decrease by the same factor. So, neAvd is constnat ⇒ I is constant.

A steady current flows in a metallic conductor of non-uniform cross section. The quantity/quantities constant along the length of the conductor is/are
[IIT-JEE 1997]

The correct option is D
current only

We know, $I = n e A v_{d}$

The product $A v_{d}$ is constant.
So when A increases by some factor, $v_{d}$ will decrease by the same factor.

So, $n e A v_{d}$ is constnat $\Rightarrow$ I is constant.