Question

calculate the length of the wire of diameter 0.2 mm and relativity 1.2 x 10^-7 Ohm m should be taken from a coil of 50 Ohm resistance.​

Answer 1

Answer:

7.536×10^-17 m

Explanation:

R= 50 ohm;

d= 0.2 mm =>r= 0.1 mm =10^-4;

p(rho)= 1.2×10^-7;

p= R×length/Area

length = 1.2×10^-7×3.14×10^-8/50

length = 7.536×10^-17 m