A metal wire has diameter 0.25 mm and electrical resistivity of 0.8×10-8 ohm m.what will be the length of his wire to make a resistance 5 ohm
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R= p l /A
l = 5 × 2 × 3.14 × 0.25 × 10-³ / 0.8 × 10⁻⁸
l = 7.85 × 10⁵ / 0.8
l = 9.8125 × 10⁵ m
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