What will be the magnetic field at a distance r when an electric current flows through these things ?

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Solution

When current flows through a wire, magnetic field is produced around it, quantitatively expressed by Ampere's law.
Magnetic field around straight wire is $\frac{μ_{0} I}{2 π r}$
Magnetic field in a current carrying loop is $\frac{μ_{0} I}{2 r}$

Magnetic field in several turns of wire is $μ_{0} \frac{N}{l} I$

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What will be the magnetic field at a distance r when an electric current flows through these things ?

When current flows through a wire, magnetic field is produced around it, quantitatively expressed by Ampere's law.Magnetic field around straight wire is μ0I2πrMagnetic field in a current carrying loop is μ0I2rMagnetic field in several turns of wire is μ0NlI