Three copper rods are subjected to different potential difference. Compare the drift speed of electrons through them. Assume that all $3$ are at the same temperature.
| Length | Diameter | Potential difference | |
| $(A)$ | $L$ | $3d$ | $V$ |
| $(B)$ | $2L$ | $d$ | $2V$ |
| $(C)$ | $3L$ | $2d$ | $2V$ |
Medium
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