yes
Yes it can. putting a magnet linked to magnetic object in water will not cause them to separate, only may weaken the attraction
Because salt isn't magnetic
A nail would be the best answer.
no salt is non magnetic
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.
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 magnet is more dense then water
No water can't go through glass.
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.
what are the things pass through magnet fields?
electricity in a generator is made by spinning a magnet inside a coil the flux lines of the magnet will cut through the coil and create a current. you can turn the magnet in numerous ways, by using wind mills, water mills, or heating water with coal, oil, gas or nuclear energy, and let the steam rush into a turbine which then moves the magnet.