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An electron enters a magnetic field at right angles to it. The direction of force acting on the electron will be _____.
- a)to the right
- b)to the left
- c)out of the page
- d)into the page
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
An electron enters a magnetic field at right angles to it. The directi...
Understanding the Lorentz Force
The motion of an electron in a magnetic field can be explained by the Lorentz force law, which states that a charged particle experiences a force when it moves through a magnetic field.
Key Concepts:
- **Charge of an Electron**: An electron carries a negative charge.
- **Magnetic Field Direction**: The direction of the magnetic field (denoted by B) is crucial in determining the force's direction.
- **Velocity of the Electron**: The electron enters the magnetic field at right angles, meaning its velocity (V) is perpendicular to the magnetic field lines.
Applying the Right-Hand Rule:
To determine the direction of the force acting on the electron:
- **Right-Hand Rule**: Although the electron has a negative charge, we use the right-hand rule for convenience. Point your fingers in the direction of the velocity (V) and curl them in the direction of the magnetic field (B). The thumb then points in the direction of the force (F) for a positive charge.
Determining the Force Direction:
- With the electron moving into the magnetic field at right angles:
- If the magnetic field is directed *into the page*, using the right-hand rule, the thumb points out of the page.
- However, since the electron is negatively charged, the force will be in the opposite direction of the thumb’s indication.
Conclusion:
- Therefore, the force acting on the electron will be directed *into the page*.
This analysis confirms that the correct answer is option **D**: into the page.
The motion of an electron in a magnetic field can be explained by the Lorentz force law, which states that a charged particle experiences a force when it moves through a magnetic field.
Key Concepts:
- **Charge of an Electron**: An electron carries a negative charge.
- **Magnetic Field Direction**: The direction of the magnetic field (denoted by B) is crucial in determining the force's direction.
- **Velocity of the Electron**: The electron enters the magnetic field at right angles, meaning its velocity (V) is perpendicular to the magnetic field lines.
Applying the Right-Hand Rule:
To determine the direction of the force acting on the electron:
- **Right-Hand Rule**: Although the electron has a negative charge, we use the right-hand rule for convenience. Point your fingers in the direction of the velocity (V) and curl them in the direction of the magnetic field (B). The thumb then points in the direction of the force (F) for a positive charge.
Determining the Force Direction:
- With the electron moving into the magnetic field at right angles:
- If the magnetic field is directed *into the page*, using the right-hand rule, the thumb points out of the page.
- However, since the electron is negatively charged, the force will be in the opposite direction of the thumb’s indication.
Conclusion:
- Therefore, the force acting on the electron will be directed *into the page*.
This analysis confirms that the correct answer is option **D**: into the page.
Community Answer
An electron enters a magnetic field at right angles to it. The directi...
The direction of force is perpendicular to the direction of the magnetic field and current, as given by Fleming's left-hand rule. Since the electron enters the magnetic field at right angles to it, the force is directed into the page.
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An electron enters a magnetic field at right angles to it. The direction of force acting on the electron will be _____.a)to the rightb)to the leftc)out of the paged)into the pageCorrect answer is option 'D'. Can you explain this answer?
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