PHYSICS 104: Conceptual 2
21 Cards in this Set
| Front | Back |
|---|---|
|
Two long wires carry opposite current of same magnitude as
illustrated on the right. What is the direction of the magnetic field
above, and midway between the two wires carrying current
|
up
|
|
A loop of copper passes through regions
of magnetic fields with constant velocity
as shown. Which of the following
statements is true?
|
The current in location 3 is the largest of all currents (it's right in the middle)
|
|
A straight wire of length is oriented east-west and is in a magnetic field B pointing north.
The wire is moving vertically up at a constant speed v. Which end of the rod is positively
charged?
|
west end
|
|
A double loop of wire (making 2 turns) is in the x-y plane centered at the origin. A uniform
magnetic field is increasing at a constant rate in the negative z direction. In which direction is
the induced magnetic field in the loop?
|
positive z direction ( would be negative if it was positive in z direction)
|
|
In an AC series circuit, the voltage in the inductor differs in phase with the voltage in the
capacitor by what angle
|
180
|
|
Which of the following statements characterizes the nature of electromagnetic waves and its
electric and magnetic components, E and B, correctly?
|
They are transverse waves, E is perpendicular to B
|
|
A proton is released such that its initial velocity is from right to left across this page. The
proton’s path, however, is deflected in a direction toward the bottom edge of thepage due to
the presence of a uniform magnetic field. What is the direction of thisfield?
|
into page
|
|
long wire, z axis w/ current. magnetic field is
|
proportional and tangent
|
|
Consider an AC series circuit containing a coil, capacitor and resistance is being driven at the resonant frequency. Tripling the frequency will result in what change?
|
a. Inductive reactance will triple
b. Capacitive reactance will be a third
c. Circuit impedance will increase
|
|
single polarizer reduced light by 50%. add another polarizer, light blocked. add third between two...
|
light visible between 0 and 25% original
|
|
If the induced current in a wire loop were such that the flux it produces were in the same direction as the change in external flux causing the current, which of the following conservation laws would end up being violated?
|
energy
|
|
You stand 3 feet away from a plane mirror. How far away are you from your image
|
6 feet
|
|
A wire is lying horizontally in the north-south direction and the horizontal magnetic field is toward the east. Some positive charges in the wire move north and an equal number of negative charges move south. The direction of the force on the wire will be:
|
down, into the page
|
|
Which of the following statements characterizes the nature of electromagnetic waves and its
electric and magnetic components, E and B, correctly?
|
They are transverse waves, E is perpendicular to B
|
|
when the current reaches its most negative value in an AC circuit, the charge on the capacitor
|
is zero and becoming negative
|
|
EM waves only
|
propogate in a vacuum
|
|
Red wavelengths are NOT
|
refracted through larger angles than blue
|
|
Long wavelengths have
|
lower energy
|
|
refraction changes ___ not ____
|
wavelength
frequency
|
|
The frequency in an AC series circuit is doubled. By what factor does this change the
inductive reactance?
|
2
|
|
LR circuit, time constant 8. Resistance and inductance doubled
|
time constant still 8
|
PHYSICS 104: Conceptual 2