An electron beam produces
i) Electrical field around the beam
ii) Magnetic field around the beam
iii) Electrical field is more stronger than the magnetic field
iv) Electrical and magnetic fields are not produced

Options

A. Only i & ii are true
B. Only ii & iii are true
C. Only i, ii & iii are true
D. Only iii & iv are true

Answer

To solve the question regarding the properties of an electron beam and the fields it produces, we can analyze each statement step by step:

### Step-by-Step Solution:

1. **Understanding the Electron Beam**:
An electron beam consists of a stream of electrons, which are negatively charged particles.

**Hint**: Remember that any charged particle produces an electric field around it.

2. **Electric Field Production**:
Each electron in the beam creates an electric field around itself. Since there are many electrons in the beam, the collective effect results in a net electric field around the entire beam.

**Hint**: Consider how the electric field behaves around a point charge and how it combines for multiple charges.

3. **Magnetic Field Production**:
When charges are in motion, they not only produce an electric field but also generate a magnetic field. Since the electrons in the beam are moving, they create a magnetic field around the beam.

**Hint**: Recall the right-hand rule for determining the direction of the magnetic field due to moving charges.

4. **Comparing Electric and Magnetic Fields**:
The strength of the electric field is generally greater than that of the magnetic field produced by the same moving charges. This is due to the nature of the forces involved, where the electric force is not dependent on velocity, while the magnetic force is.

**Hint**: Think about the equations governing electric and magnetic forces, particularly the Lorentz force law.

5. **Conclusion**:
Based on the analysis:
- The electron beam produces an electric field (True).
- The electron beam produces a magnetic field (True).
- The electric field is stronger than the magnetic field (True).
- It is incorrect to say that electric and magnetic fields are not produced (False).

Therefore, the correct options are i), ii), and iii).

### Final Answer:
The correct options are:
- i) Electrical field around the beam (True)
- ii) Magnetic field around the beam (True)
- iii) Electrical field is more stronger than the magnetic field (True)
- iv) Electrical and magnetic fields are not produced (False)

The correct answer is options i), ii), and iii) are true.