a wire of lengh 2meter has a resistance of 4 ohms,obtain the resistance if specific resistance is doubled,diameter is doubled,and the lengh is made three times of the first.plsss help me!
the resistance is directly proportional to
... length and specific resistance
it is inversely proportional to the cross sectional area
... (square of the diameter)
4Ω * (2P / P) * (d / 2d)^2 * (3L / L)