Question

Which part has maximum attraction in a magnet?
A) In the center.
B) On the sides.
C) On the poles.
D) On the surface.

Answer 1

Hint: Just remember, magnetic field lines go from the one end of a pole to the other, therefore, magnetic flux density at the poles is greater than any other position. Also, we know that a freely suspended magnet always aligns itself in the direction of poles.

Complete step by step solution:
Let us first talk all about a magnet.
MAGNET: A magnet is defined as a substance that produces a magnetic field and attracts other magnetic material.

MAGNETIC FIELD: The Magnetic field is defined as the vector field which is in the neighborhood of a magnet. It can also be observed around electric current and changing magnetic fields.

Now, let us come to the question. As we know, magnetic field lines align parallel to the length of a magnet. Therefore, at the center of a magnet, the magnetic attraction will be low. Moreover, the magnetic field density is low at the center.

As we know, magnetic field lines are closed at the poles and are far away from the sides, surface, and center of a magnet. The density of magnetic field lines is maximum at the poles, therefore, the attraction will be maximum at the poles.

Hence, option (C) is the correct option.

Additional Information: As we know, the magnetic field generates, when electric charges are moving. Therefore, we can calculate, the magnetic field can be calculated around a current-carrying substance by the given formula
$B = \dfrac{{{\mu _0}I}}{{2\pi r}}$
Where, $B$ is the magnetic field, ${\mu _0}$ is the permeability in free space, $I$ is the magnitude of current and $r$ is the distance. Here, the unit of the magnetic field is $T$ (tesla). Also, ${\mu _0} = 4\pi \times {10^{ - 7}}\,Tm/A$, which is the standard of permeability in free space.

Note: We can calculate the magnetic field by using the Right-hand thumb rule in which the thumb represents the direction of current and the fingers represent magnetic field lines. Also, there are many laws like Biot-Savart’s law, Ampere-Circuital law, and Gauss’s law, which are used to calculate the magnetic field.