Which of the following statements are true? A charged particle moving parallel t
ID: 1277254 • Letter: W
Question
Which of the following statements are true?
A charged particle moving parallel to the magnetic field will not be affected by it.
The larger the charge of a moving particle, the more it will speed up inside of a magnetic field.
When placing a dipole magnet into a magnetic field, it will be accelerated perpendicular to the field lines.
When placing a positive charge into a magnetic field, it will be accelerated in the direction of the field line.
The force on a charged particle moving in a magnetic field is independent of the velocity
The force on a charged particle moving in a magnetic field can be in the direction of the field.
The effect of a magnetic field on a charged particle is to increase its Kinetic Energy if the particle is positively charged.
A charged particle moving in a constant magnetic field can not have its speed increased by that field.
A magnetic field leads to the constant acceleration of charged particles.
The force on a charged particle moving in a magnetic field depends only on the magnitude of the velocity not its direction.
Explanation / Answer
When the Velocity Vector and Magnetic Field Lines Are Parallel
The magnetic force acting on a moving charged particle is the cross product of the velocity vector and the magnetic field vector, so when these two vectors are parallel, the magnetic force acting on them is zero.
A charged particle moving parallel to the magnetic field will not be affected by it.
A charged particle moving in a constant magnetic field can not have its speed increased by that field.
Explanation
A magnetic field cannot change the speed of a charged particle. It can change the particle's direction of motion, so it can change the particle's velocity, and in that way cause the particle to accelerate. Acceleration is the rate of change of velocity. Both acceleration and velocity are vector quantities and have direction as well as magnitide.
The classic example is uniform circular motion in which the particle's speed remains constant but its direction of motion continually changes, so that it is always accelerating towards the center of its circular path. This is in fact the path of a charged particle that moves perpendicularly to a uniform magnetic field, with no other forces acting on it.
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