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Physics Final Semester 2
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Preguntas del test (29)
1The electric force between a 5 C charge and a 1 C charge 9,000 m apart is:
- A0.000556 N
- B666 N
- C5,000,000 N
- D556 N
2An electrically neutral object can be attracted by a positively charged object because:
- Alike charges repel each other
- Bthe charges on a neutral object can be redistributes
- Cthe net charge in a system varies
- Dthe neutral object becomes charged by friction
3One ampere, or amp, is defined as ______ per second.
- Athe resistance of one ohm
- Ba difference of one volt
- Cthe flow of one coulomb
- Dthe capacity of on farad
4Because of Ben Franklin's work, the direction of current in an electoral circuit is defined as going from:
- Apositive to negative
- Bpositive to positive
- Cnegative to positive
- Dnegative to negative
5The unit of charge is the:
- Aohm
- Bampere
- Ccoulomb
- Dvolt
6As the distance between two positively charged objects increases, the force between them:
- Acannot be determined
- Bincreases
- Cdecreases
- Dremains the same
7Almost all of the electrons flowing through a battery circuit come from atoms:
- Ain the circuit components
- Bin the wire conductor
- Cin the device
- Din the battery
8The diagram that best represents the charge distribution on a neutral electroscope when a negatively charged rod is held near it is:
- AA
- BB
- CC
- DD
9One volt per one joule per:
- Aohm
- Bampere
- Ccoulomb
- Dsecond
10The electrons in an insulator are best described as
- Afixed in place
- Bflowing charges
- Cfree to move
- Da potential difference
11Two point charges attract each other with a force of 8.0E-5 N. If the distance between the charges is doubled, the force of attraction will become _____ N
- A16E-5
- B2.0E-5
- C4E-5
- D64E-5
12The electrons in a conductor are best described as:
- AFree to move
- BFixed in place
- Ca potential difference
- Dbound charges
13Suppose you rub an inflated party balloon on a carpet, hold the balloon next to a wall, and discover that it "sticks" to the wall. Why did the balloon stick to the wall?
- AExcess charge builds up on the balloon and electrostatic forces allow the balloon and wall to be attracted to one another.
- BLike charges on the balloon and wall cause attraction between the two.
- CBalloons contain a special "atomic glue" that allows them to cling to other objects.
- DThe total charge on the balloon and wall becomes zero, so attraction between the two can occur.
14Which pair of objects experiences an attractive force?
- AA and C
- BA and B
- CB and C
- DB and D
15The purpose of a commutator in an electric motor is to:
- AAttract and repel the magnets in the rotor
- BSwitch the electromagnets from north to south and back again.
- Ccreate a voltage drop so that current flows
- Dspin around so the motor can do useful work.
16All atoms act like tiny magnets. Why do only a few materials show magnetic properties?
- AWe see magnetic properties only if atomic magnets line up with Earth's geographic south and north poles. In magnetic materials, this arrangement can occur.
- BMagnetic materials have atoms that are much stronger magnets than the atoms of other materials.
- CWe see magnetic properties only if atomic magnets line up in the same direction throughout a material. In magnetic materials, this arrangement can occur.
- DAtomic magnets are magnified when combined with a rare substance. Magnetic materials contain this rare substance.
17A generator's basic function is to convert _______ to _______.
- AMechanical energy, electrical energy
- Belectrical energy, mechanical energy
- Chigh voltage, low voltage
- Dalternating current, direct current
18Electromagnets are generally more useful than permanent magnets for all of the following reasons EXCEPT:
- Athe magnetism can be turned off.
- Btheir strength can be altered
- Ctheir polarity can be changed
- Dthey are always magnetized
19You want to build a transformer the steps up voltage. You will need:
- Athe same number of turns in the primary and secondary coils
- Bmore turns in the secondary coil than the primary coil
- CNot enough information given
- Dmore turns in the primary coil than the secondary coil
20A current can be induced to flow in a coil in all of the following situations EXCEPT:
- Asliding a bar magnet into a coil of wire
- Bholding a powerful magnet in the middle of a coil of a wire
- Cmoving a coil of wire toward an electromagnet
- Ddropping a coil of wire over a bar magnet
21Two parallel current-carrying wires next to each other on a table are shown in the diagram:
If their currents are in opposite directions:
- AThe wires will move away from each other
- BNothing will happen
- Cthe wires will move toward each other
- DThe wires will life off the table
22In the figure, which direction should the magnetic field lines be pointing?
- AFrom east to west
- BFrom west to east
- CFrom south to north
- DFrom north to south
23Three ways you can increase the strength of an electromagnet are _____, _______, and add iron to the core
- Adecrease the number of coils, decrease the current
- Bdecrease the number of coils, increase the current
- Cincrease the number of coils, increase the current
- Dincrease the number of coils, decrease the current
24According to Faraday's law of induction, the faster a magnet is moved in and out of a coil:
- Athe less current is produced
- Bthe less resistance is produced
- Cthe greater the resistance produced
- DThe greater the current produced
25If you increase the current in an electromagnet:
- Aa short circuit will be created
- Bthe magnetic field will be stronger
- Cthe north and south poles will be switched
- Dthe magnetic field will disappear
26A motor's basic function is to convert ______ to ______.
- Aa mechanical energy, electrical energy
- Bhigh voltage, low voltage
- Celectrical energy, mechanical energy
- Dalternating current, direct current
27If a 12-inch long bar magnet is cut into two pieces, one inch from the north pole end of the magnet:
- Athe short piece has a north pole on both ends.
- Bthe short piece of the magnet has a north pole on one end and no pole on the other
- Cthe long piece of the magnet has a south pole on both ends
- Dboth pieces have a north and south pole on each end
28A student places two magnets with their north poles facing each other about 70.0 cm apart. When she moves one magnet toward the other, the first magnet repels the second at a distance of 26 cm. She repeats the procedure , but now places the magnets so the south pole of one faces the north pole of the other.
- Arepel the second at a distance of 52 cm
- Bagain repel the second at a distance of 26 cm
- Cattract the second at a distance of 26 cm
- Dattract the second at a distance of 52 cm
29The magnetic field is strongest for a straight wire carrying electric current:
- Aclose to the wire
- Bthere is no magnetic field around the wire
- Cat one end to the wire
- Dfar from the wire
Información
- Descripción
- Test sobre Physics Final Semester 2, creado por heurungemily el 24/05/2016.
- Autor
- heurungemily
- Idioma
- English
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