Practice test T/F help Physics211?

“Gauss’ Law for magnetic fields” holds because there are no magnetic monopoles (1 point). true false


The capacitance of a capacitor decreases when, instead of vacuum, we have a dielectric material between its plates (2 points). true false


Resistivity is measured in Ω/m. (1 point) true false


The correct SI unit of current density J is C/(m2×s). (1 point) true false


10 mT = 1 G. (1 point) true false


The end of a permanent magnet where magnetic field lines enter the magnet is called the south pole (1 point). true false


The equivalent conductance of two resistors in series is smaller than the smallest conductance of the two (2 points). true false


Near the surface of a charged conducting sphere the electric energy density is largest (2 points). true false


For a given uniform magnetic field B, the force on a current-carrying straight wire is largest when the wire is parallel to the magnetic field B (1 point). true false


If a capacitor is made to discharge through a resistor that is submerged in water, the final temperature of the water does not depend on the resistance of the resistor (2 points). true false


If the conventional current inside a battery flows from its negative terminal to its positive terminal, the battery is discharging (2 points). true false


If a 200-mA current is sent through a 1-kΩ resistor, the resistor dissipates 0.200 W (1 point). true false


A 40-ft piece of electric wire has one-fourth of the resistance of a 10-ft piece of the same type of wire (2 points). true false


When a charged particle circulates in a uniform magnetic field, the period of the circular motion is depends on the strength of the magnetic field (2 points). true false


In the capacitor charging formula q = q0 ( 1-e-t/RC ) the product RC represents the time it takes for the capacitor to acquire ~63% of its ultimate charge (2 points). true false


A 50-Ω resistor has a conductance of 20 mS (1 point). true false


If, in a tube filled with acid water, the OH- ions drift to the the left, both the current density J and the electric field E point to the left (2 points). true false


An electron moving from north to south in a region where the magnetic field is directed from east to west will be deflected down (2 points). true false


true false


If we imagine the magnetic field of a permanent bar magnet to be due to a magnetic dipole, this dipole points from the magnet’s south pole to the magnet’s north pole. (2 points). true false


The total light output of three identical light bulbs connected to a battery in series is three times more than the total light output of the same three light bulbs connected to the same battery in parallel. (2 points) true false


Two very, very long straight parallel wires carry currents of the same magnitude, but in opposite directions. A point P is in the plane containing both wires, at equal distance from each of the two wires. The magnetic field at point P is zero. (2 points). true false


Aluminum is a good conductor (2 points). true false


Two long straight wires carrying conventional currents in the same direction attract (2 points). true false


An electron moving west in a region where the magnetic field is directed from north to south will be deflected down (2 points). true false


Two protons moving away from each other along a straight line feel an attractive magnetic force (2 points). true false


When free to move, two current-carrying loops tend to reorient themselves in such a way that their magnetic dipole moment vectors point in opposite directions. true false


When a steady current is sent through two resistors connected in series, the one with the lower resistance will dissipate more power (ignore possible temperature effects). true false


In the R-C circuit capacitor discharging formula I = I0 e-t/RC the quantity I0 represents the initial current in the circuit. true false|||You're kidding right?


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