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What is DC or AC magnetic field?

Quote A truly strong magnetic field can prevent electrons from flowing through circuits. Some quartz crystals, antenna, inductors, LCDs, and semi-conductor transistors has extremely small tolerances and don‘t function if the electron flow is impeded. For example, try using a calculator within an MRI machine. Quote Can some one explain this better. And why do radios have problems with strong magnetic field .And what are DC or AC magnetic field .Do both prevent electrons from flowing through circuits?

Answer:

Hello sir,i want to make a magnet from ac to dc which can lift 1kg weight.
im not saure but the only thing i do know is that u have to put tape around the first six inches of the tank so the babys to not crawl up and get out
I am skeptical about that quote. I have built electronic devices that work just fine inside an MRI machine. Electrons are charged particles so they can be deflected by a magnetic field. That's how the beam is scanned across the face of a TV tube. If you ever see a TV tube out of a TV you will notice copper coils on the back of it. Those are the scan coils that generate the magnetic fields. Electrons moving inside a conductor are not affected that much by a static (DC) magnetic field. A radio would be affected by a strong magnetic field because radios contain magnetic components called inductors which use a material called ferrite. At a certain field strength the ferrite becomes saturated with magnetism and stops working. Many of those inductors are connected with the tuning of the radio, so the radio cannot detect a signal if they are saturated. DC static or unchanging magnetic field, AC alternating or changing magnetic field. A permanent magnet creates a DC field. Spin the magnet very quickly and you get an AC field. A DC magnetic field does not prevent electrons flowing through circuits, at least, not at the kind of field strengths we see on Earth. An AC field actually creates its own flow of electrons. An AC magnetic field has the interesting property that it will induce a current in a conductor that crosses the field. An alternating magnetic field induces an alternating current (which is what AC actually means). The reverse is also true - an alternating current in a wire creates an alternating magnetic field around the wire.

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