Question

A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filing clinging to the

• A. The North Pole is almost equal to the South Pole.
• B. The north pole is much more than the South Pole.
• C. The north pole is much less than the South Pole.
• D. The magnet will be the same all along its length.

Answer 1

The correct option is A

The North Pole is almost equal to the South Pole.

Magnetic Field Lines

1. Magnetic field lines are imaginary lines that determine the strength and direction of the magnetic field at a given point.
2. It travels from the north pole of a magnet to the south pole outside the magnet, while it travels from the south pole to the north pole inside the magnet, hence creating a closed loop.
3. The magnetic field lines never intersect with each other.
4. The tangent at any point on these magnetic field lines gives us the direction of the magnetic field at that point.
5. The density of magnetic field lines passing through a given area gives the value of magnetic flux which gives us the strength of the magnetic field in that given area.

Magnetic Effects of iron Fillings

1. When a bar magnet is immersed in a heap of iron filings and pulled out the iron chips will align themselves along the magnetic field lines.
2. From the above explanation and figure, we can see that the density of magnetic field lines is more at the two poles.
3. We can also see that the density of magnetic field lines is equal at both poles.
4. Hence, we can conclude that the amount of iron filing clinging to the North Pole is almost equal to the South Pole.

Therefore, the correct answer is option (A).