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Define magnetic field lines.
Lines showing the direction a north pole would be pushed or pulled in a magnetic field.
Define magnetic field strength (B).
The strength of a magnetic field, measured in Teslas (T). 1 T = 1 Ns/Cm.
Define Tesla (T).
The unit of magnetic field strength. 1 T = 1 Ns/Cm.
Define velocity selector.
A device that uses perpendicular electric and magnetic fields to select particles with a specific velocity.
Define mass spectrometer.
A device that uses electric and magnetic fields to determine the mass of particles by measuring the radius of their circular path in a magnetic field.
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.