Magnetic Properties of Matter

The mid points of two small magnetic dipoles of length $d$ in end-on positions, are separated by a distance $x$$\left(x\gg\,d\right)$. The magnitude of force between them is proportional to $x^{-n}$ where $n$ is :

The magnetic field of earth at the equator is approximately $4\times\,10^{-5}\text{T}$.The radius of earth is $\text{6.4}\times\,10^{6}\text{m}$. Then the dipole moment of the earth will be nearly of the order of :

Two short bar magnets of length $1\operatorname{cm}\,$ each have magnetic moments $1\operatorname{.20}\,Am^{2}$ and $1\operatorname{.00}\,Am^{2}$ respectively. They are placed on a horizontal table parallel to each…

At a certain place the angle of dip is $30^{\circ}$ and the horizontal component of earth's magnetic field is $0.5G$. The earth's total magnetic field (in $G$), at that certain place, is

Following plots show Magnetization $(M)$ vs Magnetising field $(H)$ and Magnetic susceptibility $(\chi\,)$ vs Temperature $(T)$ graph : Which of the following combination will be represented by a diamagnetic material?

The vertical component of the earth's magnetic field is $6\times\,10^{-5}T$ at any place where the angle of dip is $37^{\circ}$. The earth's resultant magnetic field at that place will be (Given…

A fighter plane of length 20 m, wing span (distance from tip of one wing to the tip of the other wing) of 15 m and height 5 m is flying towards east over Delhi. Its speed is $240ms^{-1}.$ The earth's magnetic field over…

A $25\mathrm{cm}$ long solenoid has the radius $2\mathrm{cm}$ and $500$turns. It carries a current of $15A$. If it is equivalent to a magnet of the same size and magnetization…

Two identical small bar magnets each of dipole moment $3\sqrt{5}$ J/T are placed at a center to center separation of $10$ cm, with their axes perpendicular to each other as shown in figure. The value of magnetic field…

A short bar magnet is placed in the magnetic meridian of the earth with North Pole pointing north. Neutral points are found at a distance of $30\mathrm{cm}$from the magnet on the East-West line, drawn through the middle…

At some location the horizontal component of earth's magnetic field is $18\times\,10^{-6}T.$ At this location, magnetic needle of length $0.12m$ and pole strength $1.8\mathrm{Am}$ is suspended from its mid-point using a…

A metallic rod of length $20\mathrm{cm}$ is placed in North-South direction and is moved at a constant speed of $20ms^{-1}$ towards East. The horizontal component of the Earth's magnetic field at that place is…