30. Two wires of the same material and with the same length have different diameters. Wire A has twice the diameter of wire B. If the resistance of wire B is R, what is the resistance of wire A? R 2R R/2 R/4
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Step 1: Calculate the resistance of wire A using the formula for resistance: \( R_a = \frac{\rho \cdot l \cdot 4}{\pi \cdot (2d_b)^2} \) Show more…
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