Hi all, First of all, sorry if this is a dumb question but I just wanted to make sure. Imagine the body of an electron microscope and the focusing coils on it. I know that due to the generated magnetic fields, the electrons tend to modify its distance to the central axis in a helix-like pattern. Nevertheless, I am not able to find around the effect of the associated electric field on the particle... isn't there any?. Imagine a coil whose magnetic field goes from bottom to top of the microscope, wouldn't the associated electric field tend to stop the electrons?. Thanks in advance, Jose.