Embibe Experts Solutions for Chapter: Magnetism and Matter, Exercise 1: Exercise

State Biot-Savart’s law.

Figure shows a point P near a long conductor XY carrying a current I. MN is a short current-carrying conductor kept at the point P parallel to the conductor XY. What is the direction of the force experienced by the conductor MN due to the current flowing through XY?

 What is the $\mathrm{S}.\mathrm{I}$. units of ${\mu }_0$ ?

Two iron bars $\mathrm{A}$ and $\mathrm{B}$ are identical in appearance. One of these is definitely known to be magnetised (we do not know which one). How will you find whether the other one is magnetised or not? You are not to use anything other than the two bars.

 The charged currents in the outer conducting regions of the earth's core are thought to be responsible for the earth's magnetism. What might be the battery (source of energy) to sustain these currents?

What is the behaviour of diamagnetic, paramagnetic and ferromagnetic substance in non-uniform magnetic field?

At a place the angle of dip is $30°$. If the horizontal component of earth's magnetic field is $B_H,$ the total earth's field will be

Explain origin of paramagnetism on the basis of its atomic structure.