Flashcards
Electric and Magnetic Forces
Cards in this deck (28)
- 1How is a conductor different from an insulator? A. The free movement of electrons within a conductor permits the transfer of charge. B. The free movement of protons within a conductor permits the transfer of charge. C. There is no free movement of electrons within a conductor. D. There is no free movement of protons within a conductor.A.
The free movement of electrons within a conductor permits the transfer of charge. - 2Which statement best explains the movement of electric current from the clouds to the ground during a lightning storm? A. The ground and the clouds are both negatively charged. B. The ground and the clouds are both positively charged. C. The ground is positively charged and the clouds are negatively charged. D. The ground is negatively charged and the clouds are neutral.C.
The ground is positively charged and the clouds are negatively charged. - 3Which object is an insulator? A. iron B. copper C. plastic D. salt waterC.
plastic - 4Which statement about electric force is true? A. It is a purely attractive force. B. It is a purely repulsive force. C. It is both an attractive and a repulsive force. D. It is neither an attractive nor a repulsive force.C.
It is both an attractive and a repulsive force. - 5Under which condition will air behave as conductor? A. low altitude B. high humidity C. low humidity D. high pressureB.
high humidity - 6Two charged objects, A and B, exert an electric force on each other. What happens if the distance between them is increased? A. The charge on B decreases. B. The charge on B increases. C. The electric force between them decreases. D. The electric force between them increases.C.
The electric force between them decreases. - 7Two charged balloons 2.1 × 10^-1 meters apart have a repulsive force of 1.3 × 10^-1 newtons. The charge on one balloon is 8.2 × 10^-7 coulombs. What is the charge on the other balloon? (k = 9.0 × 10^9 newton·meters^2/coulomb^2) A. 7.7 × 10^-7 coulombs B. 8.2 × 10^-7 coulombs C. 9.8 × 10^-7 coulombs D. 7.2 × 10^-8 coulombsA.
7.7 × 10^-7 coulombs - 8After brushing, Fluffy's fur has a charge of +8.0 × 10^-9 coulombs and her plastic brush has a charge of –1.4 × 10^-8 coulombs. If the distance between the fur and brush is roughly 5.0 × 10^-1 meters, what is the approximate magnitude of the force between them? (k = 9.0 × 10^9 newton·meters^2/coulomb^2) A. 5.0 × 10^-6 newtons B. 2.0 × 10^-4 newtons C. 4.0 × 10^-6 newtons D. 2.5 × 10^3 newtonsC.
4.0 × 10^-6 newtons - 9The force acting between two charged particles A and B is 5.2 × 10^-5 newtons. Charges A and B are 2.4 × 10^-2 meters apart. If the charge on particle A is 7.2 × 10^-8 coulombs, what is the charge of particle B? (k = 9.0 × 10^9 newton·meters^2/coulomb^2) A. 2.4 × 10^-2 coulombs B. 4.6 × 10^-11 coulombs C. 5.2 × 10^-11 coulombs D. 7.2 × 10^-8 coulombsB.
4.6 × 10^-11 coulombs - 10The charges on two metallic balls are 5.0 and 7.0 coulombs respectively. They are kept 1.2 meters apart. What is the force of interaction between the two? (k = 9.0 × 10^9 newton·meters^2/coulomb^2) A. 2.2 × 10^11 newtons B. 4.1 × 10^-7 newtons C. 5.0 × 10^11 newtons D. 7.0 × 10^-7 newtonsA.
2.2 × 10^11 newtons - 11How do similar (S-S or N-N) magnetic poles interact? A. They repel each other. B. They attract each other. C. They become demagnetized. D. They move closer together.A.
They repel each other. - 12The magnetic strips on credit cards can become demagnetized. What type of magnet are they? A. temporary B. permanent C. polar D. fieldA.
temporary - 13Which drawing would correctly show the magnetic field around a bar magnet? A. curved lines from the north pole of the magnet to the south pole B. curved lines near the center of the magnet C. straight lines from the south pole and from the north pole D. curved loops around the entire magnetA.
curved lines from the north pole of the magnet to the south pole - 14Which situation would create a field like the one shown here? A. interaction between two magnetic south poles B. interaction between two magnetic north poles C. interaction between a south pole and a north pole D. interaction between a magnetic south pole and a copper barC.
interaction between a south pole and a north pole - 15What does every magnet possess? A. iron metal B. strong magnetic field C. repulsion D. north and south polesD.
north and south poles - 16What is the magnetic force on a stationary proton in a magnetic field of 0.50 tesla? For a proton, q = 1.6 × 10^-19 coulombs. A. 0 newtons B. 1.6 × 10^-19 newtons C. 1.9 × 10^-18 newtons D. 3.2 × 10^-18 newtonsA.
0 newtons - 17A positive charge is moving across a room from south to north. A magnetic field runs from east to west. In what direction is the magnetic force on the moving positive charge? A. toward the east B. toward the west C. toward the floor D. toward the ceilingD.
toward the ceiling - 18Assuming the same current is running through two separate coils, why is it easier to thrust a magnet into a wire coil with one loop than one with four loops? A. because the electric field is stronger B. because the magnetic field is stronger C. because the electric field is weaker D. because the magnetic field is weakerD.
because the magnetic field is weaker - 19A proton travels at a speed of 2.0 × 10^6 meters/second. Its velocity is at right angles with a magnetic field of strength 5.5 × 10^-3 tesla. What is the magnitude of the magnetic force on the proton? A. 1.0 × 10^-15 newtons B. 1.8 × 10^-15 newtons C. 2.1 × 10^-16 newtons D. 5.5 × 10^-16 newtonsB.
1.8 × 10^-15 newtons - 20What field(s) does a moving electron have? A. electric and gravitational fields B. magnetic and gravitational fields C. gravitational, electric, and magnetic fields D. electric field onlyC.
gravitational, electric, and magnetic fields - 21Which is an advantage of AC over DC power? A. AC voltage can be transformed into other voltages through transformers. B. AC voltage is more easily used in the home. C. AC circuits are safer. D. It's easier to produce AC voltage with a portable, chemical battery.A.
AC voltage can be transformed into other voltages through transformers. - 22If the emf produced in a wire is 0.88 volts and the wire moves perpendicular to a magnetic field of strength 0.075 newtons/amperes·meter at a speed of 4.20 meters/second, what is the length of the wire in the magnetic field? A. 0.27 meters B. 2.8 meters C. 0.020 meters D. 3.7 metersB.
2.8 meters - 23What is the term for producing a current by changing a magnetic field? A. magnetic conduction B. magnetic transformation C. magnetic induction D. magnetic generationC.
magnetic induction - 24Which is a characteristic of a step–down transformer? A. There are fewer loops in the secondary coil than in the primary coil. B. It converts direct current into alternating current. C. The voltage of the secondary coil is greater than that of the primary coil. D. There are fewer loops in the primary coil than in the secondary coil.B.
It converts direct current into alternating current. - 25Which law states that the direction of the induced current is such that the magnetic field resulting from the induced current opposes the change in the field that caused the induced current? A. Faraday's law B. Lenz's law C. Oersted's law D. Ampere's lawB.
Lenz's law - 26What does a step–up transformer increase? A. power B. energy C. force D. voltageD.
voltage - 27Which is an advantage of AC over DC power? A. AC voltage can be transformed into other voltages through transformers. B. AC voltage is more easily used in the home. C. AC circuits are safer. D. It's easier to produce AC voltage with a portable, chemical battery.A.
AC voltage can be transformed into other voltages through transformers. - 28A wire that is 0.20 meters long is moved perpendicularly through a magnetic field of strength 0.45 newtons/amperes·meter at a speed of 10.0 meters/second. What is the emf produced? A. 10.65 volts B. 9.35 volts C. 0.90 volts D. 4.4 voltsC.
0.90 volts
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- - Introduction to Electrostatics - Coulomb's Law - Magnets and Their Fields - Magnetic Forces - Magnetic Induction
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- Elexali Olayvar
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