Question

Find the resistance of eureka wire 1.1m long and 0.2mm in diameter. Resistivity of eureka=49 X 10-8 ῼm

Answer 1

Dear Usha,

◆ Answer -

R = 17.15 ohm

● Explaination -

# Given -

l = 1.1 m

d = 0.2 mm = 2×10^-4

ρ = 49×10^-8 ohm-m

# Solution -

Area of cross section of eureka wire can be written as -

A = πr^2

A = 3.142 × (2×10^-4/2)^2

A = 3.142×10^-8 m^2

Resistance of the eureka wire will be calculated as -

R = ρ × l / A

R = 49×10^-8 × 1.1 / 3.142×10^-8

R = 17.15 ohm

Thanks for asking..