Magnetism and M...

β rays deflected in

Demagnetisation of magnets can be done by:

If a diamagnetic substance is brought near north or South Pole of a bar magnet is:

The only property possessed by ferromagnetic substances is

Substance in which the magnetic moment of a single atom is not 0 is known as

The magnetic moment of diamagnetic atom is

A superconductor exhibits perfect

Which one of the following is non-magnetic substance?

At time $$t = 0$$ magnetic field of $$1000$$ Gauss is passing perpendicularly through the area defined by the closed loop shown in the figure. If the magnetic field reduces linearly to $$500$$ Gauss, in nest $$5s$$, then induced EMF in the loop is:

The figure gives experimentally measured B vs. H variation in a ferromagnetic material. The retentivity, co-ercivity and saturation, respectively, of the material are :

The corecivity of a small magnet where the ferromagnet gets demagnetized is $$3 \times 10^3 Am^{-1}$$. The current required to be passed in a solenoid of length $$10 cm$$ and number of turns $$100$$, so that the magnet gets demagnetized when inside the solenoid is:

A cylindrical conducting rod is kept with its axis along positive z-axis, where a uniform magnetic field exists parallel to z-axis. The current induced in the cylinder is

A current carrying loop is placed in a uniform magnetic field in four different orientations, I, II, III & IV, arrange them in the decreasing order of Potential Energy.

The magnetic susceptibility is negative for:

The magnetic moment of a diamagnetic atom is

A short bar magnet of magnetic moment $$0.4  J  {T}^{-1}$$ is place in a uniform magnetic field of $$0.16  T$$. The magnet is stable equilibrium when the potential energy is

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. the energy required to rotate it by $$60^o$$ is $$W$$, Now the torque required to keep the magnet in this new position is.

A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from.