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23-01-2024
Physics

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A long straight wire with a circular cross section having radius R, is carrying a steady current I.The current I is uniformly distributed across this cross-section. Then the variation of magnetic field due to current I with distance r (ro B ∝ r²
o B ∝ r
o B ∝ 1/r²
o B ∝ 1/r

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