Give the factors on which the magnetic field produced by a current-carrying solenoid depends.

$A$ magnetic compass shows a deflection when placed near a current-carrying wire. How will the deflection of the compass be affected if the current in the wire is increased? Support your answer with a reason.

$A$ circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is $ON$. The current as seen from points $A$ and $B$ (in the plane of paper and on the axis of the coil) is anti-clockwise and clockwise respectively. The magnetic field lines point from $B$ to $A$. The $N-$ pole of the resultant magnet is on the face close to

What is a solenoid? Draw the pattern of magnetic field lines of a solenoid through which a steady current flows.

Whose magnetic field is like a magnetic field of a bar magnet?

How can you magnetise a piece of magnetic material?