WAEC - Physics (2024 - No. 40)
Four pieces of constantan wire, marked E, F, G, and H, each of length 1.0m, are at the temperature. Their respective diameters are 1 mm, 2 mm, 6 mm, and 10 mm. Which wire has the highest resistance?
E
F
G
H
ব্যাখ্যা
Using the equation, R = \(\frac{\rho l}{A}\)
we conclude that the wire with the smallest diameter will have the highest resistance i.e. wire E