(a) What is a solenoid? Draw a sketch of the pattern of field lines of the magnetic field through and around a current carrying solenoid.
(b) Consider a circular loop of a wire lying in the plane of the table. Let, the current pass through the loop clockwise. Apply the right hand rule to find out the direction of the magnetic field inside and outside the loop.
(a) Solenoid: A solenoid is a coil of several circular turns of insulated conducting wire, wrapped closely in the shape of a cylinder.
(b)The direction of the magnetic field inside the loop will be the downward direction, i.e., from the top of the table towards its bottom.
The direction of the magnetic field outside the loop will be in the upward direction, i.e., from the bottom of the table towards its top.
[The direction of the magnetic field produced around a current-carrying conductor is determined by the Right-Hand Thumb Rule. According to this rule.
If one holds a current-carrying conductor with the right hand, such that the thumb points in the direction of the current flowing through the conductor, the other fingers will wrap around the conductor in the direction of the field lines of the magnetic field due to the conductor.].