A portion of length L is cut out of a conical solid wire the two ends of this portion have circular cross - sections of radii `r_(1)and r_(2) (r_(2)gtr_(1))`. It is connected lengthwise to a circuit and a current I is flowing in it The resistivity of the material of the wire is `rho` . Calculate the resistance of the considered portion and the voltage developed across it .

Explanation

To solve the problem of finding the resistance of a conical solid wire and the voltage developed across it, we can follow these steps:

### Step 1: Understand the Geometry of the Wire
We have a conical wire with a length \( L \) and two circular cross-sections at the ends with radii \( r_1 \) and \( r_2 \) (where \( r_2 > r_1 \)). The wire is connected to a circuit with current \( I \) flowing through it.

### Step 2: Determine the Area of Cross-Sections
The area of a circular cross-section is given by:
\[
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