- Complete the equation that relates the
 variables R, L, and A.
 The resistance, R, of a wire varies directly
 a
 with it's length, L, and inversely with it's cross-
 sectional area, A. The wire has a length of
 500 cm, a cross-sectional area of 0.04 cm2,
 and a resistance of 0.25 ohms.
 R = [?]L/A