Question

how can you show that magnetism in a bar magnet is strongest as its pole.

Answer 1

put iron nails or any conductor in front of the bar magnet ..
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the attraction in the poles (north & south) occurs ... there the highest attraction possibility held..
hope it helpss ✌✌

Answer 2

Take a bar magnet and place it on a table.

Take a cardboard(or paper) and place it on the magnet.

Sprinkle some iron dust(small particles of iron) on the cardboard and tap the corner slowly.

You will see the iron dust arranging itself in pattern similar to the magnetic field of a bar magnet.

You will see that the number of lines is very dense near the poles and very loose near the middle.

It shows that the magnetic field strength is high near the poles.

Hope it helps!:)