What is not true regarding magnetic force and magnetic intensity?
Correct answer: B. If an electron's movement is parallel to the magnetic field, it will rotate anticlockwise.
- A. If an electron's movement is parallel to the magnetic field, it will experience no force.
- B. If an electron's movement is parallel to the magnetic field, it will rotate anticlockwise.
- C. If an electron enters perpendicular to the magnetic field, it will move in a circular path.
- D. If an electron enters perpendicular to the magnetic field, the force experienced will be maximum.
Explanation
The correct answer is Option D: If an electron enters perpendicular to the magnetic field, the force experienced will be maximum. This is because the magnetic force on a charged particle is given by the equation F = qvB sin(θ), where θ is the angle between the velocity vector and the magnetic field vector. The force is maximal when θ = 90 degrees, meaning the electron enters perpendicular to the field.Option A is incorrect because no force is exerted when the movement is parallel to the magnetic field. Option B is incorrect as there is no force to cause rotation in this orientation. Option C is incorrect because entering perpendicular doesn't make the path parallel to the plane; instead, it results in circular motion.
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About Charged Particle in a Magnetic Field
A charged particle moving through a magnetic field experiences the Lorentz force, which is perpendicular to both its velocity and the field. The motion may be circular or helical, with questions involving radius, angular frequency, time period, and work done. A stationary charge feels no magnetic force.
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