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Physics

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1A small, positive charge is placed at the black dot. In which case is the force on the small, positive charge the largest?C.
2A small, positive charge is placed at the black dot. In which case is the force on the small, positive charge the smallest?D.
3All charges in the diagrams below are of equal magnitude. In each scenario (A – D), a small positive charge is placed at the black dot. In which case is the force on the small, positive charge the largest?C.
4All charges in the diagrams below are of equal magnitude. In each scenario (A – D), a small positive charge is placed at the black dot. In which case is the force on the small, positive charge the smallest?D.
5The field inside a charged parallell plate capacitor isuniform
6Two parallel plates have charges of equal magnitude but opposite sign. What change could be made to increase the field strength between the plates?Increase the magnitude of the charge on both plates.
7Rank in order, from largest to smallest, the forces Fa to Fe a proton would experience if placed at points a – e in this parallel-plate capacitor.Fa = Fb = Fc = Fd = Fe
8A set of electric field lines is directed as below. At which of the noted points is the magnitude of the field the greatest?Triangle
9A set of electric field lines is directed as below. At which of the noted points is the magnitude of the field the smallest?Square
10A dipole is held motionless in a uniform electric field. For the situation below, when the dipole is released, which of the following describes the subsequent motion?The dipole remains motionless.
11dipole is held motionless in a uniform electric field. For the situation below, when the dipole is released, which of the following describes the subsequent motion?The dipole rotates counterclockwise.
12A dipole is held motionless in a uniform electric field. For the situation below, when the dipole is released, which of the following describes the subsequent motion?The dipole rotates clockwise.
13You are told to use Gauss’ Law to calculate the electric field a distance R away from the center of a charged cube. Which of the following Gaussian surfaces is best suited for this purpose?The field cannot be calculated using Gauss’ Law.
14A positively charged solid conducting sphere is contained within a negatively charged conducting spherical shell as shown. The magnitudes of the total charges on each sphere are the same. What direction is the field between the blue and red sphere?Outward
15A positively charged solid conducting sphere is contained within a negatively charged conducting spherical shell as shown. The magnitudes of the total charges on each sphere are the same. What direction is the field outside the red sphere?Zero
16A charged spherical insulator shell has inner radius a and outer radius b. The charge density on the shell is ?. What is the magnitude of E at the dashed line (r)?Zero
17The units of potential difference areJ/C
18New units of the electric field were introduced in this chapter. They are:V/m
19—Negative potential energy becomes more negative.
20Rank the identical bulbs in the following circuit according to their brightness, from brightest to dimmest.A = D > B = C
21In Trial 1, a battery is connected to a single lightbulb and the brightness noted. Now, in Trial 2, a second, identical, lightbulb is added. How does the brightness of these two bulbs compare to the brightness of the single bulb in Trial 1?The brightness is less
22A battery is connected to a resistor. Increasing the resistance of the resistor willdecrease the current in the circuit.
23A battery is connected to a resistor. As charge flows, the chemical energy of the battery is dissipated asthermal energy
24A resistor is connected to a 3.0 V battery; the power dissipated in the resistor is 1.0 W. The battery is traded for a 6.0 V battery. The power dissipated by the resistor is now4.0 W
25A battery is connected to a wire, and makes a current in the wire. Which of the following changes would increase the current? (1) Increasing the length of the wire; (2) keeping the wire the same length, but making it thicker; (3) using a battery with a higher-rated voltage; (4) making the wire into a coil, but keeping dimensions the same; (5) increasing the temperature of the wire.2 and 3
26Which terminal of the battery has a higher potential?the top of the terminal
27When three resistors are combined in series the total resistance of the combination isgreater than any of the individual resistance values.
28The time constant for the discharge of this capacitor is4 s
29In the circuit shown below, the switch is initially closed and the bulb glows brightly. When the switch is opened, what happens to the brightness of the bulb?The bulb gets dimmer.
30The SI unit for the strength of the magnetic field istesla
31The shape of the trajectory that a charged particle follows when it moves perpendicular to a uniform magnetic field isa circle.
32The magnetic field of a straight, current-carrying wire isaround the wire.
33Point P is directly between you and the wire as you look straight ahead at it. In which direction is the magnetic field at P?down
34The diagram below shows a current loop perpendicular to the page; the view is a “slice” through the loop. The direction of the current in the wire at the top and the bottom is shown. What is the direction of the magnetic field at a point in the center of the loop?To the right
35The diagram below shows slices through two adjacent current loops. Think about the force exerted on the loop on the right due to the loop on the left. The force on the right loop is directedto the left
36A loop carrying a current as shown rests in a uniform magnetic field directed to the right. If the loop is free to rotate,it will rotate counterclockwise
37The magnetic field at point P is zero. What are the magnitude and direction of the current in the lower wire?5 A to the left
38What is the direction of the current in this solenoid, as viewed from the top?Counterclockwise
39Which of the following will cause an induced current in a coil of wire? A. A magnet resting near the coil. B. The constant field of the earth passing through the coil. C. A magnet being moved into or out of the coil. D. A wire carrying a constant current near the coil.A magnet being moved into or out of the coil.
40A battery, a loop of wire, and a switch make a circuit below. A second loop of wire sits directly below the first. Just before the switch is closed, what can we say about the current in the lower loop?The loop has no current.
41A battery, a loop of wire, and a switch make a circuit below. A second loop of wire sits directly below the first. Immediately after the switch is closed, what can we say about the current in the lower loop?The loop has a clockwise current.
42A battery, a loop of wire, and a switch make a circuit below. A second loop of wire sits directly below the first. Long after the switch is closed, what can we say about the current in the lower loop?The loop has no current.
43A battery, a loop of wire, and a switch make a circuit below. A second loop of wire sits directly below the first. Immediately after the switch is reopened, what can we say about the current in the lower loop?The loop has a counterclockwise current.
44A loop of wire of area A is tipped at an angle to a uniform magnetic field B. The maximum flux occurs for an angle . What angle will give a flux that is ½ of this maximum value?θ = 60°
45A conducting loop is halfway into a magnetic field. Suppose the magnetic field begins to increase rapidly in strength. What happens to the loop?The loop is pushed to the right, out
of the magnetic field.
46The speed of electromagnetic waves in a vacuumis the same for all waves regardless of wavelength.
47The photon energy of electromagnetic wavesdepends upon the wavelength.
48A plane electromagnetic wave has electric and magnetic fields at all points in the plane as noted below. With the fields oriented as shown, the wave is movinginto the plane of the paper.
49Comparing infrared (IR) and ultraviolet (UV), we can say thatIR has longer wavelength and lower photon energy.
50A radio tower emits two 50 W signals, one an AM signal at a frequency of 850 kHz, one an FM signal at a frequency of 85 MHz. Which signal has more photons per second?The AM signal has more photons per second.
51An old analog cell phone has a frequency of 850 MHz, and a digital phone a frequency of 1950 MHz. Compared to the signal from an analog cell phone, the digital signal hasshorter wavelength and higher photon energy.