Question

Resistance of a copper wire 200 m long is 21 ohm. If thickness is 0.44 mm it's specific resistence is

Answer 1

Answer:

Explanation:length ,l=200m

Resistance,R=21 ohm

Area of cross section(thickness),A=o.44mm=. 0.44×10^-3 m

Specific Resistance =RA/l=

21×.0.44×10^-3/200= 0.925 ohm