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A Steady current flows in a metalic conductor of non uniform cross section. The quantity/quantities which remain constant along the length of the conductor is/areA. Current, electric field and drift speedB. Drift speed onlyC. Current and drift speedD. Current only |
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Answer» Correct Answer - D (d) If `E` electric field, then current denstiy `j = sigma E` Also we know that current density `j = (i)/(A)` Hence `j` is different for different area of cross-section. When `j` is different, then `E` is also different. Thus `E` is not constant for different `j` value. Hence, only current `i` will be constant. |
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