Question

The resistance of a wire of length 300m and cross-section area 1x 10-5m2 (read as..10 to the power of -5 sq.mtr) made of material of resistivity 1×10-7Ωm (read as..10 to the power of -7Ωm) is

Answer 1

Explanation:

Given

length of the resistor (l)=300m

cross-section area of resistor(A)=10^-5m^2

resistivity(p)=10^-7 ohm-m

resistance (R)=pl/A

=10^-7×300/10^-5

=3ohms