PY 212 Ridgley Test 5 Chapter 17 and 18

C. increases

A hydrogen atom consists of a proton and an electron. If the orbital radius of the electron increases, the potential energy of the electron ? . A. depends on the zero point of the potential B. decreases C. increases D. remains the same

C. The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is equal to the force exerted on the carbon nucleus.

A hydrogen nucleus, which has a charge e, is situated to the left of a carbon nucleus, which has a charge 6e. Which statement is true? A. The electrical force experienced by the hydrogen nucleus is to the right, and the magnitude is equal to the force exerted on the carbon nucleus. B. The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is greater than the force exerted on the carbon nucleus. C. The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is equal to the force exerted on the carbon nucleus. D. The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is less than the force exerted on the carbon nucleus.

C. Trajectory Z

An electron is initially moving to the right when it enters a uniform electric field directed upwards. Which trajectory shown in the figure above will the electron follow? A. Trajectory X B. Trajectory W C. Trajectory Z D. Trajectory Y

C. zero

Four charged particles (two having a charge +Q and two having a charge -Q) are distributed on the xy-plane, as shown in the figure above. The charges are equidistant from the origin. The voltage is zero at infinity. The voltage at location P, which is on the z axis, is ? . A. negative B. positive C. zero D. impossible to determine based on the information given

E. impossible to determine based on the information given

If the voltage at a point in space is zero, then the electric field must be ? . A. zero B. uniform C. negative D. positive E. impossible to determine based on the information given

C. V_1 + V_2=V_3

In the circuit shown in the figure, the capacitors are initially uncharged. The switch is first thrown to position A for a long time and then to position B. Let the charges on the capacitors be Q1, Q2, and Q3 and the potential difference across them be V1, V2 and V3. With the switch kept in position B ? . A. Q_1=Q_2=Q_3 B. Q_1 + Q_2=Q_3 C. V_1 + V_2=V_3 D. V_1=V_2=V_3 E. V_3=V_0

D. 2d

One charged plastic ball is vertically above another in a test tube as shown in the figure above. The balls are in equilibrium a distance d apart. If the charge on each ball is doubled, the distance between the balls in the test tube would become ? . A. 8d B. d C. 4d D. 2d

B. The voltage at points A and B are equal, and the voltage at point C is lower than the voltage at point A.

Suppose a region of space has a uniform electric field, directed toward the right, as shown in the figure above. Which statement is true? A. The voltage at point A is the highest, the voltage at point B is the second highest, and the voltage at point C is the lowest. B. The voltage at points A and B are equal, and the voltage at point C is lower than the voltage at point A. C. The voltage at all three locations is the same. D. The voltage at points A and B are equal, and the voltage at point C is higher than the voltage at point A.

B. VW

The figure above shows two unequal charges +q and -Q, of opposite sign. Charge Q has greater magnitude than charge q. Point X is midway between the charges. IN what section of the line will there be a point where the resultant electric field is zero? A. YZ B. VW C. WX D. XY

E. each conductor must be at the same potential

Two conductors are joined by a long copper wire. Thus ? . A. the potential on the wire is the average of the potential of each conductor B. the electric field at the surface of each conductor is the same C. no free charge can be present on either conductor D. each conductor carries the same free charge E. each conductor must be at the same potential

D.

Two identically charged balls are a certain distance apart. The vectors in the figure above show the magnitude and direction of the electrostatic force on each ball. Suppose the charge on the left ball is now doubled (represented by two plus signs). Which diagram below best represents the forces that now act on the two balls?

C. negative and positive

X and Y are two uncharged metal spheres on insulating stands, and are in contact with each other. A positively charged rod R is brought close to X as shown in Figure A. Sphere Y is now moved away from X (Figure B). What are the final charge states of X and Y, respectively? A. positive and neutral B. neutral and positive C. negative and positive D. neutral and neutral