Magnetism and M...

The most appropriate magnetization $$ M $$ versus magnetising field $$ H $$ curve for a paramagnetic substance is

For ferromagnetic material, the relative permeability $$ ( \mu_r) $$  , versus  magnetic intensity $$ (H) $$ has the following shape

The basic magnetization curve for a ferromagnetic material is shown  in figure. Then, the value of relative permeability is highest for the point  

The variation of magnetic susceptibility $$ (\chi) $$ with absolut temperature $$ T $$ for a ferromagnetic material is

Magnetic susceptibility is negative and very less for :

If a conducting rod moves with a constant velocity $$ v $$ in a magnetic field, emf is induced between both its ends if:

The cause of dimegnetism is :

The phase difference between induced emf and magnetic flux linked with a coil rotating in a uniform magnetic field is:

Which of the following is not suitable for the core of the electromagnets ?

An electric motor is a device to convert electrical energy into mechanical energy. The motor shown below has a rectangular coil $$(15\ cm \times 10\ cm)$$ with 100 turns placed in a uniform magnetic fleld $$B=2.5\ T$$. When a current is passed through the coil, lt completes $$50$$ revolutions in one second. the power output of the motor is $$1.5\ kW$$. The current rating of the coil should be