Yes
what are the things pass through magnet fields?
yes
The magnet should be able to extract iron out of water as water and iron are not chemically combined. If the water and iron would have chemically combined then it would be futile to separate them using a magnet. Note that the stronger the magnet the more iron will be removed from water.
A nail would be the best answer.
No, salt water passing through a magnet does not create electricity. In order to generate electricity, you need a conductor moving through a magnetic field, such as in a generator or dynamo. The salt water itself is not conducting electricity in this scenario.
Interesting question. The answer is maybe - it depends on the construction of the electromagnet. the key is the electromagnet must be water proof, and the wiring used to create the magnet must be insulated from water - if this is not done, then current will flow through the water, which will decay the effectiveness of the electromagnet, along with robbing it of strength due to a decrease in current through the magnet.
No, a magnet would not be effective in separating salt from water as salt is not magnetic. Instead, the mixture could be separated through the process of evaporation, where the water would be evaporated, leaving the salt behind.
The iron filings experiment demonstrates that a magnet's force can pass through certain materials. Placing iron filings on a piece of paper and then placing a magnet underneath the paper will cause the filings to align along the magnetic field lines, showing that the magnet's force is able to pass through the paper.
A magnet is not effective at separating salt and water because salt is not attracted to magnets. The components in the mixture have different physical properties (magnetism for the magnet, solubility for the salt) that make it impossible to separate them using a magnet. You would need to use methods like evaporation or filtration to separate salt from water.
yes it can
That statement is not true. Yes a magnet will attract a steel paper clip through air or water. No, a magnetic field will penetrate glass as well... probably. Certain types of glass (which are themselves ferromagnetic) might serve to block a magnetic field.
Lines of force go from a North pole of a magnet to the South pole external to a magnet, and through the magnet itself. This path is the magnetic circuit. It may be diverted and distorted by magnetic materials nearby.