not really. is depends on what kind of magnets they are.
Magnets doesn't have any effect on cancers.
Vacuum has no effect on the actions of magnets.
Some of the water heaters uses magnets. Magnets softens the water.
Yes, water has almost no effect on magnetic fields. (though electromagnets might have a shortcircut)
it does effect the distance because it is far
magnets dont lose their magnetism under water. According to me magnets do attract paper under water.
yes even though magnets repel water
If you find that magnets have a soothing effect on your skin, you are experiencing what is known as the placebo effect. It's soothing because you expect it to be soothing.
Magnets have no demonstrable positive effect on health. Magnets cannot cure or prevent disease or injury, or speed the healing process.
Yes, some water heaters have magnets in them. Not every water heater does, but the ones that do have magnets are great to use for water treatment reasons.
The further the magnets, the lesser the attraction/repulsion.