A watch glass containing some powdered substance is placed between the pole pieces of a magnet. Deep concavity is observed at the centre. The substance in the watch glass is

If a watch-glass containing a small quantity of water is placed on two dissimilar magnetic poles, then water …………… .

Assertion (A): If one arm of a U- tube containing a diamagnetic solution is placed in between the poles of a strong magnet with the level in line with the field, the level of the solution falls, Reason (R ): Diamagnetic substances do not aligned with the field

Assertion (A): If one arm of a U- tube containing a dia magnetic solution is placed in between the poles of a strong magnet with the level in line withh the field, the level of the solution falls, Reason (R ): Diamagnetic substances are

A glass is filled with water up to its brim and a thick hand card placed on top of it. Now keeping the card tightly closed and pressed with palm, the glass full of water is inverted and placed upside down. The palm is gently removed from the card. It is observed that the piece of card does not fall off the glass though the glass is full of water and its whole weight is exerting pressure on the card. Why does it happen?

If a piece of ferromagnetic substance is placed in a non uniform magnetic field, how will it behave ?

Magnetic materials are classified as diamagnetic, paramagnetic and ferromagnetic based on their properties. If you place the above three magnetic substances between the pole pieces of a magnet, through which magnetic substance magnetic lines of force easily pass through and through which it passesleast ? Justify your answer.