By placing an iron-like metal inside the solenoid,its magnetic field becomes $......$

What does the divergence of magnetic field lines near the ends of a current-carrying straight solenoid indicate?

Choose the incorrect statement from the following regarding magnetic field lines.

You are given two identical-looking iron bars,out of which one of them is a magnet. Just using these two bars,how will you identify which one is a magnet?

$A$ compass needle is placed near a current-carrying wire. State your observation for the following cases and give the reason for the same in each case:
$(a)$ Magnitude of electric current in the wire is increased.
$(b)$ The compass needle is displaced away from the wire.

An electron enters a uniform magnetic field at right angles to it as shown in the figure below. In which direction will this electron move? State the rule applied by you in finding the direction of motion of the electron.