Question

A metal wire of apecific resistance 64*10^-6 ohm meter and length 1.98 cm has a resistance of 7 ohm find its radius

Answer 1

Answer:

7.5×10^-4m

Explanation:

p(rho)=RA/l

64*10^-6=(7×3.14×r^2)/0.0198

(64*10^-6×0.0198)/7×3.14=r^2

r=7.5×10^-4m