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A depiction of a famous scientific experiment is given. Consider how the beam changes when the magnet is off compared to when the magnet is on.

A bell-shaped evacuated glass tube with a narrow end and a wide end is connected to a battery at the narrow end. In the center of the tube, there is a negatively charged plate above the tube, a positively charged plate below the tube, and a magnet with the field turned off. A beam originating at the narrow end of the tube travels toward the wide end of the tube. With the magnetic field turned off, the beam path bends toward the positively charged plate and ends at the lower half of the wide end of the tube.

A bell-shaped evacuated glass tube with a narrow end and a wide end is connected to a battery at the narrow end. In the center of the tube, there is a negatively charged plate above the tube, a positively charged plate below the tube, and a magnet with the field turned on. A beam originating at the narrow end of the tube travels toward the wide end of the tube. With the magnetic field turned on, the beam path travels in a straight path to the center of the wide end of the tube.

What type of beam was used in this experiment?

Answer :

The experiment involves a cathode ray beam manipulated by electric and magnetic fields, with the magnetic field's presence causing the beam to travel straight towards the centre of the wide end of the bell-shaped tube.

We have,

The experiment you described involves a beam of charged particles, most likely electrons, being manipulated by an electric field and a magnetic field within the bell-shaped evacuated glass tube.

The beam's behaviour is influenced by the interaction between these fields.

When the magnetic field is turned off, the beam's path bends toward the positively charged plate due to the influence of the electric field.

This bending occurs because the electrons in the beam experience a force from the electric field, causing them to move in the direction of the force.

When the magnetic field is turned on, the beam's path travels in a straight line to the centre of the wide end of the tube.

This change in behaviour is due to the interaction between the magnetic field and the moving charged particles (electrons).

The magnetic field exerts a force on the moving electrons, causing them to experience a perpendicular force that deflects their path.

In this case, the magnetic force compensates for the electric force from the charged plates, resulting in a straight path through the centre of the wide end of the tube.

Thus,

The experiment involves a cathode ray beam manipulated by electric and magnetic fields, with the magnetic field's presence causing the beam to travel straight towards the centre of the wide end of the bell-shaped tube.

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Rewritten by : Barada

Final answer:

The beam used in this experiment is an electron beam. It is influenced by both electric and magnetic fields. The deviation created by the electric field is counteracted when the magnetic field is introduced, causing the beam to travel in a straight path.

Explanation:

The experiment described is a classic physics demonstration involving a beam of electrons. Electrons are negatively charged particles that will be attracted toward the positive plate and thus would bend toward it when no magnetic field is involved. However, when a magnetic field is turned on, it introduces a force at right angles to the original force of the electric field causing the beam path to move in a straight line to the center of the wide end of the tube. This is a result of the principle known as the Lorentz force that a charge moving in a magnetic field experiences a force perpendicular to its direction of motion and the magnetic field.

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