If the direction of current is reversed,the direction of magnetic field is also reversed.

What is a solenoid?

What is the shape of the magnetic field lines around a circular current-carrying conductor?

How will the magnetic field produced in a current-carrying circular coil change if we increase the:
$(i)$ value of current flowing through it?
$(ii)$ distance of point $P$ from the coil?
$(iii)$ number of turns of the coil?

With the help of a labelled circuit diagram,illustrate the pattern of field lines of the magnetic field around a current-carrying straight long conducting wire. How is the Right-Hand Thumb Rule useful to find the direction of the magnetic field associated with a current-carrying conductor?

The magnetic field produced by a straight current-carrying conductor is in the form of concentric circles.