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Two different wires X and Y of same diameter but different materials are joined in series across a battery. If the number density of electrons in X is twice that in Y, find the ratio of drift velocity of electrons in the two wires. |
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Answer» Drift velocity, Vd = \(\frac{I}{neA}\) = \(\frac{I}{n(nd^2/4)e}\) i.e., Vd ∝ \(\frac{1}{n}\) Since the wires are connected in series, Current I through both is same. Given, nx = 2ny ∴ \(\frac{(v_d)x}{(v_d)y}\) = \(\frac{n_y}{n_x}\) = \(\frac{1}{2}\) |
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