Embibe Experts Solutions for Chapter: Magnetism and Matter, Exercise 1: Gujarat Board-2018

A bar magnet is oscillating in Earth's magnetic field with the time period $\mathrm{T}$. If a similar magnet with the same mass and dimensions has magnetic dipole moment $4$ times that of this magnet, then the periodic time will be______.

Magnetic meridian is a plane___.

When a paramagnetic substance is brought near the north or a south pole of a bar magnet. It_____.

An electric dipole of moment $\overrightarrow{\mathrm{P}}$ is placed in a uniformed magnetic field $\overrightarrow{\mathrm{E}}$. The dipole is rotated through a very small angle $\theta$ from equilibrium and is released. Prove that it executes simple harmonic motion with periodic time 

$\mathrm{T}=2\mathrm{\pi }\sqrt{\frac{\mathrm{I}}{\mathrm{PE}}}$ where $\mathrm{I}$= moment of inertia of the dipole.

For superconductors, ${\mu }_r=$_________.

A straight steel wire of length $l$ has magnetic moment $m$. If the wire is bent in the form of a semicircle, what is the new value of the magnetic dipole moment?

State and explain Curie law of paramagnetic materials and explain saturation magnetization for paramagnetic materials

Which one of the following represents Curie's law?