Question

When the north pole of a strong magnet is brought near to the north pole of a weak magnet then they will

A. Attract each other
B. Repel each other
C. First attract and then repel
D. First repel and then attract.

Answer 1

Hint: Electrostatics and magnetism are analogous in many ways. The formulas we derive in electrostatics can mostly be used in magnetism like formulas for electric dipole and formulas for magnetic dipole, but with slight changes. The method of induction works in both electrostatics and magnetism and it justifies our solution.

Complete step by step answer:
In electrostatics basically there are different ways of charging like direct contact and induction. In case of direct contact we bring the charged particle near the uncharged particle and due to the potential difference the charge will be transferred from the charged body to the uncharged body. In this manner we can charge the uncharged body. The other way to charge is induction. Here we don’t touch the charged body with the uncharged body but we bring both bodies closer so that opposite charge will be induced on the uncharged body and if we earth the uncharged body and move the charged body farther then the charge remains on the uncharged body even after we unearth it. So this is also the way of charging.
Same methods can be followed to induce the magnetism in the unmagnetized body.
Coming to the question, when we bring the strong north pole near the weak north pole, due to the induction phenomenon the strong south pole will be induced on the weak north pole and both the poles will attract each other.
Hence option A will be the answer.

Note:
As far as magnetism is considered, there are three kinds of magnetic materials, diamagnetic and paramagnetic and ferromagnetic. In diamagnetic this induction wont work. Same type of pole will be induced at the side which is near the magnetic pole and hence diamagnetic substances repel from the magnets.