Can you have a magnetic field without an electric field and why are the electric field and magnetic fields in a velocity selector perpendicular to each other?
Yes, you can have a magnetic field without an electric field. For example, a permanent magnet generates a magnetic field without producing an electric field. This is because the magnetic field of a permanent magnet is caused by the alignment of the spins of electrons in the material, not by the motion of charges.
You can also have an electric field without a magnetic field. For example, the electric field around a stationary point charge produces no magnetic field. This is because the electric field of a point charge does not involve the motion of charges.
In a velocity selector, the electric and magnetic fields are perpendicular to each other. The electric field deflects charged particles in one direction, and the magnetic field deflects them in the opposite direction. Only particles with a specific velocity will pass through the velocity selector without being deflected.
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