Two magnetic field lines around a bar magnet-

The diagram shows a current carrying wire passing through the centre of a square card board. The magnetic field at points $A$, $B$  and $C$ is:

A constant current I flows in a horizontal wire in the plane of the paper from West to East as shown in the figure. The direction of magnetic field at a point will be South to North

Observe the diagram.

The magnetic poles represented by P and Q respectively are

A bar magnet is used to pick up an iron nail

At which part P, Q, and R is the easiest for the magnet to pick up the iron nail? 

The figure shows the magnetic field lines of a magnetic field. There are three points $A$, $B$ and $C$ in this field. Choose the correct option regarding field strength.

Observe the following diagram and choose the correct alternative.

Which of the following is NOT correct for magnetic filed lines?

In figure, magnetic field between two magnets is shown. Which magnetic poles are present at point A and point B respectively of magnets?