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A cylindrical conductor of length 6 m and cross sectional area 20 mm² has a resistance of 15 Ω. A potential difference of 120 V is maintained across the ends of the conductor. If the current density is uniform, what is its magnitude? A. 8x 10⁵ A/m² B. 3 x 10⁵ A/m² C. 6x 10⁶ A/m² D. 4x 10⁵ A/m² E 2 x 10⁶ A/m²
Sagot :
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