Circuits
What happens to the current if you increase the resistance but keep the voltage constant?
Decreases
What direction does the electric field point around a negative charge?
Toward the charge.
What is the shape of the magnetic field around a long straight current-carrying wire?
Concentric Circles
What is required to induce a current in a loop of wire?
A changing magnetic flux
What two fields oscillate in an electromagnetic wave?
Electric and magnetic fields.
In a series circuit, is the voltage across each resistor the same or different?
Different
What happens to the electric potential when moving against the electric field?
It increases.
Magnetic fields exert forces on what kind of particles?
Moving charged Particles
What rule tells you the direction of the induced current
Lenz’s Law.
In what direction do the electric and magnetic fields oscillate relative to the direction of wave motion?
Perpendicular (transverse wave)
A capacitor stores energy in what form?
Electric Potential Energy
True or False: Conductors in electrostatic equilibrium have zero electric field inside them
True.
What happens to the direction of the magnetic force if the velocity of a charge is parallel to the magnetic field?
No force (force is zero).
If the magnetic flux through a coil increases, in what direction will the induced current flow?
To oppose the increase (producing its own opposing magnetic field).
What fundamental set of equations predicts electromagnetic waves?
Maxwell’s Equations.
How does a dielectric inserted between capacitor plates affect the capacitance?
Increases it
If two like charges are brought closer together, what happens to their potential energy?
It increases.
True or False: Magnetic monopoles (isolated magnetic charges) have been found.
False
What happens to the induced current if the magnetic field is constant?
No induced current.
If the frequency of an electromagnetic wave increases, what happens to its wavelength?
It decreases.
In an AC circuit, what is the role of inductance at high frequencies?
It acts like a strong resistor
Using Gauss’s Law, what is the field inside a uniformly charged solid conductor?
0 ( Zero )
In a mass spectrometer, how does a magnetic field separate particles?
By causing curved paths depending on their mass-to-charge ratio.
A bar magnet is dropped through a copper loop. Describe the current as it falls and exits.
Current flows one way as it enters, reverses as it exits.
Light slows down in materials because of what physical effect?
Interaction with the material’s electric charges (causing delay in re-emission).