Applying Biot-Savart's law find

$\left(\mathrm{iii}\right)$ Magnetic field due to an infinite straight wire carrying current.

State Biot-Savart law. Using this law, derive the expression for the magnetic field due to a current carrying loop of radius$\text{'}{R}^{\text{'}},$ at a point which is at a distance $x$ from its centre along the axis of the loop. Draw the magnetic field lines due to a circular current carrying loop.

State Biot-Savart law. Using this law, derive the expression for the magnetic field due to a current carrying loop of radius ${{}^{\text{'}}R}^{\text{'}},$ at a point which is at a distance $x$ from its centre along the axis of the loop. Draw the magnetic field lines due to a circular current carrying loop.