Question

the resistance of a wire of length 80cm and of uniform area of cross section 0.025 cm square is found to have 1.5 ohm calculate the resistivity of the wire?

Answer 1

Explanation:

Resistance = 1.5 ohm

Length of wire = 80 cm

Area of cross section = 0.025 cm sq.

We know,

$r = pl \div a$

where p = resistivity

Therefore,

$1.5 = p \times 80 \div 0.025$

$p = 1.5 \times 0.025 \div 80$

$p = 0.00046875$