Question

a copper wire has diameter 0.5mm and resistivity of 1.6×10 to the power 8 ohm meter .what should be the length of this wire to make its resistance 10 ohm plz answer guys plz !!!!!

Answer 1

Answer:

80. ------------------------

Answer 2

Explanation:

just use the formula

R=r L/A

where r is resistivity L is length and A is area of the wire

I think the resistivity should be of the power -8 cause copper is a good conductor

so

L=RA/r =250*π/6.4= 122.7 metre