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# What is the purpose of the magnetic field in a cathode ray tube?

## What is the purpose of the magnetic field in a cathode ray tube?

anode: Positively charged electrode, when electric current runs through a cathode ray tube. cathode : Negatively charged electrode, when electric current runs through a cathode ray tube. magnetic field: An area where magnetism acts. It deflects cathode rays.

How does electromagnetic deflection work in a cathode ray tube?

A high voltage is transmitted to the cathode ray tube, inducing the cathode to emit electrons – essentially an electrical current. That rule describes how a charged particle (our electron) moving in a magnetic field will be deflected by that field at a right angle to both the field and to the direction of the particle.

### When a magnetic field is applied to the cathode ray tube?

When only electric field is applied, the electrons deviate from their path and hit the cathode ray tube at point A. Similarly when only magnetic field is applied , the electron strikes the cathode ray tube at point C.

Are cathode rays affected by magnetic fields?

When an external electric field is applied, the cathode ray is deflected toward the positive pole. When a magnetic field is applied, the cathode ray is deflected from its normal straight path into a curved path.

#### What will happen when a magnetic needle is kept in a non uniform magnetic field?

A magnetic needle is also known as a magnetic dipole. In a non-uniform Magnetic field, the force on each of the poles will be dissimilar in both magnitude and direction. Due to changes in Magnitude, the dipole undergoes a Force, Due to changes in direction the dipole undergoes a Torque.

Are cathode rays deflected by electric field?

Cathode rays can be deflected by an electric field, which is evidence of it being composed of electron particles rather than photons. They are deflected by electric field towards the positive plate. when the cathode rays were passing through it; the divisions on the plate enabled the path of the rays to be determined.

## What direction is magnetic field?

The direction of magnetic field lines is defined to be the direction in which the north end of a compass needle points. The magnetic field is traditionally called the B-field.

What is CRT explain with diagram?

A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, the beams of which are manipulated to display images on a phosphorescent screen. The images may represent electrical waveforms (oscilloscope), pictures (television set, computer monitor), radar targets, or other phenomena.

### What is the principle of CRT?

Principle of Operation— The function of the cathode-ray tube is to convert an electrical signal into a visual display. The tube contains an electron-gun structure (to provide a narrow beam of electrons) and a phosphor screen.

How does the cathode ray tube ( CRT ) work?

In other Words, the CRT generates the beams, accelerates it at high velocity and deflec t it for creating the images on the phosphorous screen so that the beam becomes visible. The working of CRT depends on the movement of electrons beams.

#### What kind of deflection is used in a CRT?

Most smaller CRTs use electrostatic deflection, which occurs when the electron beam is deflected as it passes through charged metal plates; the direction of deflection depends on the amount of charge and polarity of the plates.

How does electromagnetic deflection in a cathode ray tube work?

The tutorial, a simplified depiction of how a CRT works, can be set on automatic or adjusted manually by clicking the appropriate radio button. When the tutorial is in manual mode, the beam of electrons emitted by the cathode in the electron gun will hit the center of the screen until one of the two external magnets is moved.

## How are cathode rays affected by magnetic fields?

Reaching this understanding required many small but important experimental steps to determine, for instance, whether cathode rays travel in straight lines, carry energy or, as explored in this tutorial, are affected by magnetic fields. Scientists used special vacuum tubes, such as the Crookes tube and the cathode ray tube, to study this phenomenon.