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Compute the magnitude of the magnetic field of a long, straight wire carryinga current of 1 A at distance of 1m from it. Compare it with Earth’s magnetic field. |
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Answer» Magnetic field due to a long wire B = μ x 2I / 4π r where I is current and μ / 4π = 10-7 , r is distance from the wire Putting the values B = 10-7 x 2 x 1 / 1 = 2 x 10-7 T . earth’s magnetic field = 45 x 10-6 T = 450 x 10-7 So the magnetic field is 225 times less strong than earth’s magnetic field . |
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