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Q. |
Mean drift velocity of electron in a copper wire having cross-sectional area 5.0 × 10 -6 m2 carrying current of 1 A and having number density 8.5 × 10 28 m3 is {{}} |
A. | 0.015 mm s-1 |
B. | 0.1 mm s-1 |
C. | 0.5 mm s-1 |
D. | 0.25 mm s-1 |
Answer» A. 0.015 mm s-1 |
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