Daily Concept Quiz
Daily Concept Quiz
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 1 If an electrically neutral rubber rod is rubbed against an electrically neutral piece of fur, we know that A) the fur and the rod both pick up the same charge. B) the fur and the rod both remain uncharged. C) the fur and the rod pick up equal but opposite charges. D) the fur and the rod each pick up different amounts of opposite charge. 2 A neutral piece of iron A) does not have any charge. B) has equal amounts of positive and negative electrons. C) has equal numbers of protons and electrons. D) has equal numbers of protons and neutrons. 3 A proton and an electron are separated by 0.03 mm. If the distance between them changes to 0.06 mm, the force between the charges is A) one fourth of the original force. B) half the original force. C) equal to the original force. D) twice the original force. E) four times the original force. 4 If a charged object is held near (but not touching) small bits of aluminum foil, the foil pieces A) are attracted to the charged object because they become charged as they are ripped up. B) are attracted to the charged object because one side of each aluminum piece becomes slightly more negative than the other side. C) are not attracted to the charged object because the aluminum has no net charge. D) are repelled by the charged object because one side of each aluminum piece becomes slightly more negative than the other side. E) are repelled by the charged object because they become charged as they are ripped up. 5 In a conducting material, such as a piece of copper wire, A) some of the electrons are free to move readily. B) all of the electrons are free to move readily. C) all of the protons are free to move readily. D) some of the protons are free to move readily. E) both electrons and protons move readily. 6 If you pump water through a pipe that has an open end, water will spill out and run all over the ground. If you connect a battery to one end of a wire and set the other end on a table top, A) no electrons will flow. B) electrons will flow out of the wire and spill out over the table top. C) electrons will flow but build up at the end of the wire instead of spilling out. 7 A 6 V battery is connected in a circuit. If the 6 V battery is replaced by a 12 V battery, A) the electrons move twice as fast in the circuit. B) the electrons move half as fast. C) twice as many electrons are moved around the circuit in the same amount of time. D) half as many electrons are moved around the circuit in the same amount of time. 8 A thick copper wire is connected in a circuit to a battery. If the thick wire is removed and replaced by a thinner copper wire of the same length then we know that A) the resistance is smaller and the current is smaller. B) the resistance is bigger and the current is smaller. C) the resistance is smaller and the current is bigger. D) the resistance is bigger and the current is bigger. 9 A copper wire is connected in a circuit to a battery. If the wire is removed and replaced by a longer copper wire of the same thickness then we know that A) the resistance is smaller and the wire is hotter. B) the resistance is bigger and the wire is hotter. C) the resistance is smaller and the wire is not as hot. D) the resistance is bigger and the wire is not as hot. 10 A strong positive charge is placed at a point in space. We know that the magnetic field that this charge produces at a nearby point in space is A) strong. B) weak. C) zero. 11 Two current carrying wires are placed parallel to each other. The force between the two wires A) is zero. B) is attractive. C) is repulsive. D) Can be attractive or repulsive depending on the direction of the current in the wires. 12 To produce a current in a single closed loop of wire (with no batteries) you would have to A) place it in a magnetic field. B) move it towards a magnet. C) move it away from a magnet. D) A and B but not C. E) B and C but not A.