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Reading Quiz #9 1. What is the equivalent resistance of a series of resistors? a) sum of the individual resistances b) inverse of the sum of the inverse resistances 2) Which is NOT one of Kirchhoff’s rules for circuits? a. Junction rule b. Loop rule c. Resistance rule d. None of the above Reading Quiz #10 1) What determines the time it takes to charge up a capacitor in an RC circuit? a) Battery voltage and current b) Battery voltage and resistance c) Current and capacitance d) Capacitance and resistance e) None of the above 2) What should be avoided to prevent electric shock? a) standing next to high voltage b) flow of current through body parts c) touching the ground wire d) All of the above Reading Quiz #11 1) Magnetic field lines outside of a magnet run from a) south to north pole b) north to south pole c) there is no magnetic analog of electric field lines 2) The force of a magnet on a current-carrying wire is a) zero b) perpendicular to direction of the current c) parallel to the direction of the current 3) The unit of the magnetic field is a) Oersted b) Farad c) Weber d) Tesla Reading Quiz #12 1) Which is (are) true? The magnetic dipole moment of a current loop a) b) c) d) e) Is prop. to the area of the loop Is prop. to the current in the loop Is well-defined only far away from the loop All of the above Two of the above 2) The oil-drop experiment is used to a) b) c) d) Measure the mass of the electron Measure the charge of the electron Measure the ratio of charge and mass of the electron None of the above Reading Quiz #13 1) The magnetic force between two wires is a) proportional to the distance d between them b) proportional to 1/d c) proportional to 1/d2 2) The force between two parallel currents (going in the same direction) is … a. b. c. Zero Repulsive attractive Reading Quiz #14 1) Ampere’s Law says that … a) the magnetic flux through an area is proportional to the current in a closed loop b) the integral of the magnetic field along a closed path is proportional to the current enclosed by the path c) none of the above 2) In the modern definition, which is more fundamental, i.e. easier to measure? a) Current measured in Amperes b) Charge measured in Coulombs Reading Quiz #15 1) The Biot-Savart Law … a) Can be used to determine a B field of a current b) Is the same as Ampere’s law c) Is the same as Gauss’ law d) None of the above 2) The magnetic field of a solenoid … a) Is strongest outside of the solenoid b) Is highly directional, along the axis of the solenoid c) Will be in the same direction regardless of the direction of the current flowing through its wire d) None of the above Reading Quiz #16 1) Ferromagnetic materials can be made into strong permanent magnets a) True b) False c) Depends on the exact composition 2) Which type of material will weaken the original (external) magnetic field? a. b. c. d. Ferromagnetic Paramagnetic Diamagnetic None of the above