Question

If a length of a wire is l and resistivity is rho and radius of wire is 10 cm what will be the new resistance

Answer 1

Answer:

Hence, the new resistance of the wire = 7pl / 2200 ohms

Explanation:

We know that,

When the wire of length 'l' with a area of cross section 'A' and specific resistivity 'rho - p', then the resistance 'R' of the wire :

R = (p × l) / A

Here its is given,

Radius of wire = 10 cm

Area = πr^2 = 22/7 × 10 × 10 = 2200/7 cm^2

Resistivity = rho (p)

Length = l

Then,

Resistance, R :

R = (p × l) / (2200/7) = 7pl / 2200 ohms

Hence, the new resistance of the wire = 7pl / 2200 ohms