Maybe, maybe not. The first computer was enormous, expensive and slow, but now almost everyone can have a much faster, cheaper and smaller one in their home. If we are ever able to generate such high magnetic fields with reasonably sized machinery and a logical budget, maybe then we would have artificial gravity. The problems to work around are not only these. All in all, it is easier said than done.
Microwaves cause the water molecules in food to vibrate very rapidly, which results in heating.
People who eat food cooked in a microwave will have no harmful effects, but food cooked in a convection oven tastes better. Microwave ovens only heat food by exciting the molecules in it. The heat comes from the energy released by this agitation, which is not harmful. Microwaves are known as non-ionizing radiation. In a nuclear reactor, things are different.