Acopper wire and an iron wire of equal length l and diameter d are joined, and a potential difference v is applied between the ends of the composite wire. calculate the potential difference (in volts) across the iron wire. assume that l = 2.97 m, d = 0.88 mm, and v = 157 v.

The potential difference across the iron wire 134.2 V.

Explanation:

Given that,

Length = 2.97 m

Diameter = 0.88 mm

Total potential = 157 V

We know that,

The resistivity of iron wire

The resistivity of copper wire

The voltage for each wire is proportional to the resistivity.

We need to calculate the resistance for copper wire

Using formula of resistance

Put the value into the formula

We need to calculate the resistance for iron wire

Using formula of resistance

Put the value into the formula

The total resistance is

We need to calculate the potential difference across the iron wire

Using formula of potential difference

Put the value into the formula

Hence, The potential difference across the iron wire 134.2 V.

the answer is b, have negligible mass