Question

The resistance of a wire of length 70 cm and of uniform area of cross-
section 0.025 cm² is found to be 2 12. Calculate the resistivity of the
wire in SI units​

Answer 1

Answer:

$resistance of the wire = 1.5Ω$

$cross \: sectional \: area \: = 0.025cm {}^{2}$

$length \: of \: wire = l \: = 70cm$

$since \: resistivity \: = r \times a \div l$

$1.5 \div 0.025 \times 70 = 4.2 \times 10 {}^{2}$