1.

Write an expression for the magnetic field produced by aninfinitely long straight wire carrying acurrent I, at a short perpendicular distance a from itself.please give explanation​

Answer»

Answer:

Ampere's law EQUATION  

∮  B  .  dℓ=μ∑i

Here  

B.  ℓ=μ∑i

here  

dμ  length  element perpendicular to the PLANE of PAPER  

∮  B.  dℓ=μ  o∑i

B → MAGNETIC field which is also perpendicular to plane of paper & align with length elements  

∮  B  .  dℓ=μ  o∑i

B.∮dℓ=μ  oi

B.2π=μ  oi

B=  2πrμ  oi



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