Magnetism and M...

Permanent magnets are the substances having the property of.

Mark the correct set of ferromagnetic substances.

Out of soft iron and steel which has more coercivity, less retentivity.

The susceptibility of a diamagnetic substance is

Consider the following statements I and II.
(I) Paramagnetism is explained by domain theory 
(II) Susceptibility of a diamagnetic substance is independent of temperature.
Identify the correct choice from the following. 

Domain formation is the necessary features of

Susceptibility is positive and small for 

The graph of X versus T for a paramagnetic substance will look like 

Which of the following statements is incorrect about hysteresis?

The earth's magnetic induction at a certain point is $$7\times 10^{-5}Wb/m^2$$. This is to be annulled by the magnetic induction at the centre of a circle conducting loop of radius $$15$$ cm. The required current in the loop is