All Flashcards
What is the effect of a magnetic force on a moving charged particle?
The magnetic force causes the particle to curve because the force is always perpendicular to the velocity.
What happens when a charged particle moves perpendicular to a uniform magnetic field?
The particle undergoes uniform circular motion (UCM).
What is the effect of balancing electric and magnetic forces on a charged particle?
Particles with a specific velocity can be selected.
What happens when charged particles from the sun interact with Earth's magnetic field?
The aurora borealis (northern lights) and aurora australis (southern lights) are created near the poles.
What is the effect of a magnetic field on electrons in a cathode ray tube?
The magnetic field can steer the electrons vertically.
What is the effect of an electric field on electrons in a cathode ray tube?
The electric field can steer the electrons horizontally.
What do the magnetic field lines look like around a bar magnet?
Magnetic field lines emerge from the north pole and enter the south pole of the magnet.
Compare how electric and magnetic fields are used in cathode ray tubes.
Electric fields: Used for horizontal steering. | Magnetic fields: Used for vertical steering.
What is the difference in using the right hand rule for positive and negative charges?
Positive charges: Use the right-hand rule directly. | Negative charges: Use the right-hand rule and reverse the force direction, or use your left hand.