PHYSICS 104: Conceptual Exam 1 Physics
23 Cards in this Set
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Two point charges, -q and q, form dipole with distance d. Distance between q and -q doubled, then force on Q...
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Quarters
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The electric field associated with a uniformly charged hollow metallic sphere is greatest at
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the sphere's outer surface
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Which of the following characteristics are held in common by both gravitational and electrostatic forces when dealing with either point masses or charge? (3)
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1. Inverse square distance law applies
2.Forces are conservative
3.Potential energy depends on distance of separation
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Inserting a dielectric material between two charged parallel conducting plates, originally separated by air and disconnected from a battery, will produce what effect on the capacitator?
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Increase capacitance
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Three resistors with resistance R1 are in a circuit. They are replaced by one equivalent resistor, R. SO,
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The current through R equals the current through R1
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A certain capacitator is charged to 10 v then at t=0 allowed to discharge. There will be a certain time before the voltage across the capacitator reaches 3. 7 V. This time can be decreased by INCREASING
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NOTHING
Must DECREASE time constant
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If an electron is released at the equator and falls toward earth under the influence of gravity, the magnetic force on the electron will be toward the...
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WEST
because the B field is toward the north
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When wire oriented parallel to magnetic field...
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Theta=0 so force=0
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Solenoid 1: L=L A=A N=N
Solenoid 2:L=2L A=2A N=2N
Which has greater magnetic field?
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Same magnetic field!
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If wires carry current in same direction...
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The force is attractive
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Excess charge placed at top of sphere
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Charge will spread uniformly over entire surface
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A small, plastic sphere of mass (m) is attached to a string as shown in the figure
below. There is an electric field (E) directed along the +x direction. The string makes
an angle θ = 30° with the y-axis. Which of the following is most likely reason for the
stability of the situa…
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Negative charge on sphere
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Two equal charges, each Q, are separated by some distance. What third charge
would need to be placed half way between the two charges so that the net force on
each charge would be zero?
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-Q/4
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The situation where the gravitational attractive force between two protons is larger
than the electric repulsion ___________.
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Is impossible
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In which case does an electric field do positive work on a charged particle?
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a negative charge moves opposite to the direction of the electric field.
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If the current in a wire is tripled, what effect does this have on the electron drift velocity in the wire?
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It triples
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Using a capacitor and two different value resistors, which of the following combinations in an RC circuit would give the greatest time constant?
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the capacitor in series with both resistors in series with each other
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We are doubling the distance across a charged parallel plate capacitor. Which is TRUE?
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Charge in capacitor stays the same
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Size of an electric current in a conductor is a function of...
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Cross sectional area
velocity
density
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Junction rule is conservation of ____ and Loop Rule is conservation of ____
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Charge
Energy
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A light bulb with a tungsten filament is attached to a source of variable voltage. As the voltage is increased on the bulb:
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the bulb's resistance increases.
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A planar metallic plate is charged by friction and moved into a parallel configuration with a second
planar plate that is grounded. The ground connection is broken and the first plate is moved far away.
The charge on the second plate
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is equal in magnitude and of the opposite sign as the charge of the first plate.
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A parallel plate capacitor is connected in series to a battery and charged to the full battery potential.
Without disconnecting the battery, the plates are moved to twice the original separation. The charge
on the plates
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changes to one half the original value
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PHYSICS 104: Conceptual 2