List of top Physics Questions

A magnetic dipole is under the influence of two magnetic fields. The angle between the field directions is $60^{\circ}$ and one of the fields has a magnitude of $1.2 \times 10^{-2}\, T$. If the dipole comes to stable equilibrium at an angle of $30^{\circ}$ with this field, then the magnitude of the field is
A magnetic needle suspended by a silk thread is vibrating in the earth?s magnetic field. If the temperature of the needle is increased by $700^{\circ}C$, then
A magnetic needle suspended horizontally by an unspun silk fibre oscillates in the horizontal plane, because of the restoring force originating mainly from
A magnetising field of $1500\, A\, m^{-1}$ produces flux of $2.4 \times 10^{-5}$ weber in a iron bar of the cross-sectional area of $0.5 \,cm^2$. The permeability of the iron bar is
A magnetising field of $1600\, A\, m^{-1}$ produces a magnetic flux of $2.4 ? 10^{-5}\, Wb$ in an iron bar of cross-sectional area $0.2\, cm^2$. The susceptibility of an iron bar is
A permanent magnet in the shape of a thin cylinder of length $50 \,cm$ has intensity of magnetisaton $10^6\, A\, m^{-1}$. The magnetisation current is
A short bar magnet of magnetic moment $0.4\, J\, T^{-1}$ is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is
A temporary magnet is made of
A toroid of $n$ turns, mean radius $R$ and crosssectional radius a carries current $I$. It is placed on a horizontal table taken as $x-y$ plane. Its magnetic moment $\overrightarrow{M}$
Among the following properties describing diamagnetism identify the property that is wrongly stated.
If a compass needle be kept at magnetic north pole of the earth, the compass needle may stay in any direction. Dip needle will stay vertical at the north pole of earth
The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. Soft iron has high magnetic permeability and cannot be easily magnetized or demagnetized.
At a certain place, the angle of dip is $30^{\circ}$ and the horizontal component of earth?? magnetic field is 0.50 oersted. The earth?? total magnetic field (in oersted) is
At magnetic poles, the angle of dip is
At the magnetic north pole of the earth, the value of the horizontal component of earth?? magnetic field and angle of dip are respectively
If $\mu_0$ is absolute permeability of vacuum and $\mu_r$ is relative magnetic permeability of another medium, then permeability $\mu$ of the medium is
Imagine rolling a sheet of paper into a cylinder and placing a bar magnet near its end as shown in figure. What can you say about the sign of $\vec{B}.d \vec{A}$ for every area $d \vec{A}$ on the surface?
In a certain place, the vertical component of earth?? magnetic field is 0.5 oersted and dip angle is $60^?$. The earth?? magnetic field at that place is
In the magnetic meridian of a certain place the horizontal component of earth?? magnetic field is 0.25 G and dip angle is $60^?$. The magnetic field of the earth at this location is
Magnetic dipole moment is a vector quantity directed from
Magnetic meridian is
Magnetic susceptibility of a diamagnetic substances
Point out the correct direction of magnetic field in the given figures.
The range of magnetic susceptibility and relative magnetic permeability for diamagnetic substances are
The time period of a freely suspended magnetic needle does not depend upon