Electricity and Magnetism - SS2 Physics Past Questions and Answers - page 4
In which direction does a positively charged particle move when placed in a magnetic field and experiencing a magnetic force?
In the direction of the magnetic field
Opposite to the direction of the magnetic field
Perpendicular to the direction of the magnetic field
None of the above
A charged particle moving in a magnetic field experiences a maximum magnetic force when its velocity is:
Parallel to the magnetic field
Antiparallel to the magnetic field
Perpendicular to the magnetic field
None of the above
The magnitude of the magnetic force acting on a charged particle moving in a magnetic field depends on:
The charge of the particle
The velocity of the particle
The strength of the magnetic field
All of the above
A proton and an electron enter a magnetic field with the same velocity. Which particle experiences a greater magnetic force?
Proton
Electron
Both experience the same force
It depends on the direction of the magnetic field
A charged particle moves in a circular path in a magnetic field. If the magnetic field is doubled while keeping the velocity of the particle constant, what happens to the radius of the circular path?
It doubles
It halves
It remains the same
It quadruples
Explain the motion of a charged particle in a uniform magnetic field. How does the velocity and magnetic field direction affect the path of the particle?
When a charged particle moves in a uniform magnetic field, it experiences a magnetic force perpendicular to both its velocity and the magnetic field direction. The force acts as a centripetal force, causing the particle to move in a circular path. The radius of the circular path depends on the particle's velocity, charge, and the strength of the magnetic field. If the velocity is parallel or antiparallel to the magnetic field, there will be no magnetic force acting on the particle, and it will move in a straight line. If the velocity is at an angle to the magnetic field, the particle will follow a helical path.
Discuss the factors that determine the magnitude and direction of the magnetic force on a charged particle moving in a magnetic field.
The magnitude and direction of the magnetic force on a charged particle depend on several factors. Firstly, the magnitude of the force is proportional to the charge of the particle and the strength of the magnetic field. A greater charge or a stronger magnetic field will result in a larger force. Secondly, the direction of the force is perpendicular to both the velocity of the particle and the magnetic field direction, following the right-hand rule.
If the particle is positively charged, the force will be in one direction, while for a negatively charged particle, the force will be in the opposite direction. Lastly, the velocity of the particle also affects the force. The force is at a maximum when the velocity is perpendicular to the magnetic field and decreases as the angle between velocity and field increases.
According to Faraday's law of electromagnetic induction, the magnitude of the induced electromotive force (EMF) in a conductor is directly proportional to:
The magnetic field strength
The rate of change of magnetic field
The length of the conductor
The resistance of the conductor
A wire loop is placed in a region of a magnetic field. If the magnetic field increases in strength, the induced current in the loop will flow in a direction that produces a magnetic field:
Opposite to the original magnetic field
In the same direction as the original magnetic field
Perpendicular to the original magnetic field
Irrelevant to the original magnetic field
Which of the following factors does not affect the magnitude of the induced EMF in a conductor?
The strength of the magnetic field
The length of the conductor
The resistance of the conductor
The velocity of the conductor through the magnetic field