Question

What is magnetic field?
What is solenoid in a current.

Answer 1

Magnetic fields force moving electrically charged particles in a circular or helical path. This force—exerted on electric currents in wires in a magnetic field—underlies the operation of electric motors. (For more information about magnetic fields, see magnetism

A solenoid is a long coil of wire wrapped in many turns. When a current passes through it, it creates a nearly uniform magnetic field inside. Solenoids can convert electric current to mechanical action, and so are very commonly used as switches.

Answer 2

$magnetic \: field$ :-

A magnetic field is a picture that we use as a tool to describe how the magnetic force is distributed in the space around and within something magnetic.

$solenoid \: in \: a \: current$ :-

A solenoid is a long coil of wire wrapped in many turns. When a current passes through it, it creates a nearly uniform magnetic field inside. Solenoids can convert electric current to mechanical action, and so are very commonly used as switches.