Question

take two long wire make small circle radius r and make angle 90° find what magnetic
field at centre .​

Answer 1

The magnetic field lines from concentric field direction depends on the direction of the current I can be determined using the"right hand rule.

Answer 2

Originally Answered: What is the value of a magnetic force at the centre of a circular loop?

Concider a circle of radius R and current I

db= μo/4π {I(dl×r)/r^3}

Consider a element of angle dθ and of length dl=Rdθ

db=μo/4π {I(Rdθ)Rsin90}/R ^3

for total field

B=∫db limit from 0 to θ

B =(μoI/4πR)θ

∴ for full circle θ=2π

B=μοI/2R

this is not my own answer.

i had taken help from internet.

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