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24 Cards in this Set
- Front
- Back
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A metal ball hangs from the ceiling by an insulating thread. The ball is attracted to a positive charged rod help near the ball. The charge of t ball must be?
a. positive b. negative c. neutral d. positive or neutral e. negative or neutral |
E. negative or neutral
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If the distance between two point charges is cut in half, the electrical force will be
a.) cut in half b.) doubled C.) increased 4 times D.) decreased 4 times |
C. Increased 4 times
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you are sitting a certain distance from a point charge and you measure an electric field. if the charge is now doubled and your distance from the charge is also doubled, what is the electric field strength now?
a. 4E b. 2E c. E d. 1/2E e. 1/4E |
D. 1/2E
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in a uniform electric field in empty space, a 4 C charge is placed and it feels an electric force of 12 N. if this charge is removed and a 6 C charge is place at the point instead, what force will it feel?
a. 12 N b. 8 N c. 24 N d. no force e. 18N |
e. 18 N
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three charges arranged as shown. what is the electric field at the location X?
-Q. +Q +Q X a. southwest b north west c. north east d. south east e. south |
d. south east
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four point charges are arranged at the corners of a square. find the electric field E and the potential V at the center of the square.
-Q +Q -Q +Q a. E=0 V=0 b.E=0 V=/0 c. E=/0 V=/0 d. E=/0 V=0 E=V regardless of the value |
d. E=/0 V=0
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a proton and an electron are in a constant electric field created by oppositely charged plates. you release the proton from the positive side and the electron from the negative side. when it strikes the opposite plate, which one has more kinetic energy?
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both acquire the same KE
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a conductor in electrostatic equilibrium is carrying a new positive charge. the electric field in the interior of the conductor is...
a. points outward, toward the surface of the conductor b. points inward, away from the surface of the conductor c. is zero d. points parallel to the surface e. not enough information given to decide |
c. is zero
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The electric field is the strongest:
a. where the field lines are closest together b. where the field lines are farthest apart c. where adjacent field lines are parallel d. none of the above |
a. where the field lines are closest together
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you re-position the two places of a capacitor so that the capacitance doubles. if the charges on the two plates are kept constant in this process, what happens to the potential difference between the two plates?
a. multiplied by a factor of 4 b. multiplied by a factor of 2 c. unchanged d. multiplied by a factor of 1.2 e. multiplied by a factor of 1/4 |
d. multiplied by a factor of 1/2
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What is the relationship for parallel and series capacitors?
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Parallel: C+C+C
Series 1/C +1/C |
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when a light switch that controls a single light bulb is thrown to the "on" position, the electric energy that gets to the light built at a speed on the order of
a. the speed of light b. a few millimeters per second c. the speed od sound |
A. the speed of light
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assuming the resistance of your hair dryer obeys Ohm's law, what would happen to its power output if you plugged it directly into a 240-V outlet in Europe if it is designed to be used in a 120-V outlet?
a. its power output would double and overheat b. its power output would decrease by a factor of 2 c. its power output would quadruple and overheat d. the power output would decrease by a factor of 4 |
c. the power would quadruple and overheat
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a 60-W bulb is followed by a 40-W bulb in series to a 120-V source. which one glows brighter?
a. 60 W b. 40W c. they are the same |
B. 40 W
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a 100 km long copper cable has a circular cross section of radius 1.00 cm. if a constant of 100 A flows through the cable, what is the power loss? the resistivity of copper is p=1.7 x 10^-8
a. 1.00 kW b. 1.70 kW c. 5.41 kW d. 17.0 kW e. 54.1 kW |
e. 54.1 kW
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which of the following situations would not result in a magnetic force on the wire with the magnetic force direction points to north?
a. current flows down; magnetic field to west b. current up; mag. field east c. current east; mag field down d. current west slight down; mag field down e. current west slight up; meg field east |
d. current west and slightly down; magnetic field down
Direction would be going south instead of North |
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for a current to be induced in a wire loop, which statement is true?
a. there must be a large magnetic flux through loop b. the loop's plane must be parallel to mag. field c. the loop's plane must be perpendicular to mag. field d. magnetic flux through the loop must vary w/ time |
d. the magnetic flux through the loop must vary with time
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a transformer at a local substation of the delivery system just before your house has
a. more winding in the primary coil b. more winding in the secondary coil c. the same number of windings in both coils |
a. more winding in the primary coil
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when a bar magnet is above the plane of the loop, the current induced in the loop is counterclockwise. is the orientation of the bar magnet north pole up or south pole up?
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South Pole Up
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when two parties of the same mass enter a magnetic field with the same initial speed and follow the paths down. which particle has the bigger charge?
a. charge 2 = 10 kg b. charge 1 = 5 kg |
a. charge 2
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a wire loop is being pulled through a uniform magnetic field(into the page) that suddenly ends. what is the direction of the induced current?
a. clockwise b. counterclockwise c. no induced current |
a. clockwise
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a regular 6 V batter is connected to one side of a transformer. compared to the voltage drop across coil A, the voltage across coil b is?
a. greater than 6 V b. 6 V c. less than 6 V d. zero |
d. zero
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a square conductor moves through a uniform magnetic field (out of the page) . if the force is straight up, where do the negative and positive charges accumulate?
a. negative= bottom positive=top b. neg.= top pos.=bottom c. neg.= right positive= left d. neg.= left positive=right |
d. negative = left and positive=right
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relative to the blue end of the visible spectrum, the yellow and green regions have:
a. higher frequencies b. longer wavelengths c. shorter wavelengths d. both a and c |
c. shorter wavelengths
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