1.) In the figure, a bar magnet moves away from the solenoid. The induced current through the resistor R is: from a to b2.) DRAW IMAGE: A3.) An ampere is a unit of electrical: Current4.) When there is a change in the magnetic field in a closed loop of wire: all ofthese5.) DRAW IMAGE: C6.) Metal detectors, like the ones used at airports, are activated by: Electromagnetic induction7.) Outside a magnet, magnetic field lines are conventionally drawn from: north to south8.) While a magnet is moved toward the end of a solenoid, a voltage difference is induced between the two ends of the solenoid wire. The voltage difference would be larger if: all of the above statements are true9.) When a bar magnet is thrust into a coil of copper wire, the coil tends to: repels the magnet as it enters10) In the figure, two parallel wires carry a current I in opposite directions. A rectangular loop is midway between the wires. The current I is decreasing. The induced current through the resistor R is: from b to a 11) A 9 V battery is hooked up to two resistors in series. One has a resistance of5 and the The current at A is greater than the current at B, which is equal to the current at C, which is greater than the current at D.12) The primary source of electrons in an ordinary electrical circuit is: the electrical circuit itself13) In the figure, a bar is in contact with a pair of parallel rails and is in motion with velocity Α uniform magnetic field is present. The induced current through the resistor R is: zero14) The capacitance of a capacitor depends on: none of these15) Electromagnetic induction occurs in a coil when there is a change in: magnetic field intensity in the coil 16) If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil with twice the number of loops: twice as much voltage is induced17) Voltage can be induced in a wire by: choices a, b, and c are all correct (moving the wire near a magnet, changing the current in a nearby wire, moving a magnet near the wire18) On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in: series19) A circular wire ring is situated above a long straight wire, as shown in the figure. The straight wire has a current flowing to the right, and the current is increasing in time at a constant rate. Which statement is true: there is an induced current in the wire ring, direct in clockwise orientation20) In the figure, a battery supplies a steady current to the solenoid on the left. The two solenoids are moving toward each other. The induced current through the resistor R is: from a to b 21) Magnetic field lines about a current- carrying wire: circle the wire in closed groups22) Which statement is correct?: Charges flows in a closed circuit 23) As more lamps are put into a series circuit, the overall current in the power source: decreases24) A conducting bar is free to slide horizontally on the rails of a conducting frame, as shown in the figure. decreases25) A magnet, with its north pole pointed downwards, is falling down directly above a wire loop. As the magnet approaches the wire loop (before it passes through the loop): An induced current flows through the wire, in a counterclockwise orientation 26) Like kinds of magnetic poles repel while unlike kinds of magnetic poles: Attract27) If a steady magnetic field exerts a force on a moving charge, that force is directed: At the right angles to the direction of the motion28) A coulomb of charge that passes through a 6- volt battery is given: 6 JOULES29) In a 110 - volt circuit containing a lamp in series with the voltage source: 110 joules of energy are given up by each coulomb of charge making up the current in the circuit30) As more lamps are put into a parallel circuit, the overall current in the powersource: increases31) When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is: less than the resistance of either lamp32) A 9 V battery is hooked up to two resistors in series. One has a resistanceof 5 and the other has a resistance of 10 Several locations along the circuit are marked with letters, as shown in the figure. Which statement is true: the current at A is equal to the current at B, which is equal to the current at C, which is equal to the current at D33) In the figure, one end of a bar is in contact with a circular rail and the other end is pivoted at P. A steady, uniform, magnetic field B is present. The bar rotates about P. The induced current through the resistor R is: from b to a34) Thrust a magnet into a coil of wire and the coil: neither of these 35) A wire moving at right angles to a magnetic field has NO induced voltage: none of above36) An iron rod becomes magnetic when: the net sins of its electrons are in the same direction37) Compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have: less resistance38) Compared to a single lamp connected to a battery, two lamps connected in parallel to the same battery will carry: more current 39) When two lamps are connected in series to a battery, the electrical resistancethat the battery senses is: more than the resistance of either lamp40) Compared to a single lamp connected to a battery, two identical lamps connected in series to the same battery will carry: less current41) Moving electric charges will interact with: electric field or a magnetic field 42) A 9 V battery is hooked up to two resistors in series. One has a resistance of5 and the other has a resistance of 10 Several locations along the circuit are marked with letters, as shown in the figure. Through which resistor is energy being dissipated at the higher rate: 10 ohm resister 43) A ring with a clockwise current (as seen from above the ring) is situated with its center directly above another ring, which has a counterclockwise current, as shown in the figure. In what direction is the net magnetic force exerted on the top ring: Upward44) A negatively charged particle is moving to the right, directly above a wire having a current flowing to the right, as shown below. In which direction is the magnetic force exerted on the particle? : upward 45) A long straight wire has a constant current flowing to the right. A square ring is situated above the wire, and also has a constant current flowing through it (as shown). Which of the following statements is true? The net
View Full Document
Unlocking...