In the given diagrams, compasses are used to plot the magnetic field around a bar magnet with poles marked $N$ (North) and $S$ (South). Which of the following diagrams correctly shows the expected field pattern?

The figure shows a ring magnet $X$, floating above another ring magnet, $Y$. This is because

Reeta puts two different objects in each of the following containers.
Container (i) : Copper coin and iron nail
Container (ii) : Steel nail and aluminium earring
Container (iii) : Marble and gold coin Container
(iv) : Nickel coin and steel nail

She can use a magnet to separate the objects in containers _____.

What will happen when three bar magnets are hung in the manner as shown below?

A matchbox containing an unknown object is placed on a thin sheet of glass in the experimental set-up shown in the figure.

When the bar magnet moves, it is able to drag the match box along. What is most likely to be found in the matchbox?