A long straight wire of radius R carries a current i . The magnetic field inside the wire at distance r ( r R ) , from its centre is expressed as

Question

A long straight wire of radius R carries a current i . The magnetic field inside the wire at distance r ( r R ) , from its centre is expressed as, μ 0 i π R 2 . r, 2 μ 0 i π R 2 . r, μ 0 i 2 π R 2 . r, μ 0 i 2 π R . r

MARKS App · Accepted Answer

Using Ampere's law, we have ∮ B → . d l → = μ 0 i i n or B × 2 π r = μ 0 i π R 2 π r 2 ∴ B = μ 0 2 π . i r R 2

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