What is the correct way of showing the magnetic field?

To use this rule imagine gripping your right hand around the wire with your thumb pointing in the direction of the current. The fingers show the direction of the magnetic field which wraps around the wire. to have some motion around the nuclei of atoms. This is how permanent magnets work.

What is magnetic focusing?

Definition of magnetic focusing : the converging of a stream of electrons by means of a suitable magnetic field — compare magnetic lens.

What are the possible sources of error in the e/m experiment?

1) The greatest source of error in this experiment is the velocity of the electrons. First, the non-uniformity of the accelerating field caused by the hole in the anode causes the velocity of the electrons to be slightly less than their theoretical value.

Is it possible to control magnetic fields?

The short answer is no, there is no shield or substance that will effectively block magnetic fields as such. You can however redirect the magnetic field lines, which is what some people call magnetic shielding.

Can you magnify a magnetic field?

Liquid sodium agitated gently in a rotating tank can significantly amplify a magnetic field.

Is right hand rule for electrons or protons?

From the right hand rule for magnetic force, the force is pointed down on a negatively charged electron.

What is right hand palm rule?

The law of the right hand states that the thumb of the right hand point in the direction of v, the fingers in the direction of B and the force (F) are guided perpendicular to the right hand palm in order to locate the direction of the magnetic force on a positive moving charge.

How does an electromagnetic lens work?

A lens that converges electron beams by a magnetic field. The magnetic field in the lens, which bends electron beams, is generated by a solenoid magnet.

What is an electron lens?

A lens that performs action of convergence on electron beams similar to the lens action of an optical lens on light rays. The “electron lens” is classified into the magnetic-field type and the electric-field type. The former is called the electromagnetic lens, and the latter is the electrostatic lens.

How can you correct for large radii errors?

The best way to alleviate this error would be to obtain a larger electron tube, for larger radii are easier to measure accurately. Or perhaps all that needs to be done is simply to magnify the image of the electron path.

Why is it far easier to measure e/m experimentally than either E or M individually?

Because e/me appears in macroscopic equations, but e,me individually do not. The force equation for a general electron in an electromagnetic field is F=e(…). This makes acceleration proportional to eme. Acceleration is not that hard to measure, especially if you measure it in the form of deflection.