Flashcards

Physics Exam 2 Tophat

Emilee Ly English 46 cards

What happens to C if the area of the capacitor doubles?

Cards in this deck (46)

1What happens to C if the area of the capacitor doubles?C doubles
2What happens to C if the separation of the capacitor is cut in half?C Doubles
3Calculate the equivalent capacitance between A and B. All capacitors have the same value C.C
4Calculate the equivalent capacitance between A and B. All capacitors have the same value C. Note that there is a horizontal connection.C
5Calculate the equivalent capacitance between A and B. All capacitors have the value as marked.4C/3
6A parallel plate capacitor is charged (the plates are isolated so Q cannot change.) The plates are then pulled apart so that the plate separation d increases. The total electrostatic energy stored in the capacitor will:Increase
7What if the two plates were not isolated, but were attached to a battery, so that the voltage V between them is held fixed. Now, as we increase d, the electrostatic energy stored in the capacitor will:Decrease
8Two wires, A and B, are made of the same metal and have equal length, but the resistance of wire A is four times the resistance of wire B. How do their diameters compare? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.d_A = d_B / 2
9A wire of resistance R is stretched uniformly (keeping its volume constant) until it is twice its original length. What happens to the resistance?it increases by a factor 4
10A copper cylinder is machined to have the following shape. The ends are connected to a battery so that a current flows through the copper. Which region has the greatest current density |J|?Region B
11A copper cylinder is machined to have the following shape. The ends are connected to a battery so that a current flows through the copper. Which region has the greatest current I?All three are the same
12A copper cylinder is machined to have the following shape. The ends are connected to a battery so that a current flows through the copper. Which region has the greatest conductivity σ?All three are the same
13A copper cylinder is machined to have the following shape. The ends are connected to a battery so that a current flows through the copper. Which region has the greatest magnitude electric field |E|?Region B
14wo lightbulbs operate at 120 V, but one has a power rating of 25 W while the other has a power rating of 100 W. Which one has the greater resistance?The 25 W light bulb
15Two heaters in your living room are operated at 120 V. Heater 1 has twice the resistance of heater 2. Which one will give off more heat?Heater 2
16Which of the following points are junctions that you can apply Kirchhoff’s Junction rule with all three currents?b and e
17Which equation do you get for junction b?I_2 +I_3 = I_1
18Which equation do you get for junction e?I_1 = I_2 + I_3
19Is the following a complete loop that you can use? a->b->c->e->bNo
20Is the following a complete loop that you can use? a->b->e->f->aYes
21Is the following a complete loop that you can use? c->d->e->b->a->f->eNo
22Is the following a complete loop that you can use? a->b->c->d->e->f->aYes
23How many independent loop equations can you get from this circuit? As a group, write on the whiteboard the loop rule equation for the loop b->c->d->e->b.2
24Apply the loop rule for the loop a->b->e->f->a, which of the following is the equation you get-R_1I_1-R_2I_3+ε_2-r_2I_3-R_4I_1+ε_1-r_1I_1=0
25Which graph shows CURRENT vs TIME while CHARGING?4
26Which graph shows MAGNITUDE of CHARGE on Capacitor vs. time while charging?2
27Which graph shows the magnitude of the POTENTIAL DIFFERENCE across the CAPACITOR while CHARGING?2
28Which graph shows the magnitude of the POTENTIAL DIFFERENCE across the LIGHT BULB FILAMENT while CHARGING?4
29Which graph shows CURRENT vs. TIME while DISCHARGING?4
30Which graph shows Charge Q on Capacitor vs. TIME while DISCHARGING?4
31Which graph shows the magnitude of the POTENTIAL DIFFERENCE V_C across the CAPACITOR while DISCHARGING?4
32Which graph shows the absolute value of the POTENTIAL DIFFERENCE V_R across the LIGHT BULB FILAMENT while DISCHARGING?4
33What is the time constant for the following RC discharge circuit?2 ms
34When the North end of a magnet is brought near the positively charged ball, what will the ball do?It will not be affected by the magnet
35When the compass is placed above the beam of electrons, will it deflect?No
36If the beam were protons instead of electrons, how would the beam deflect?In the other direction as electron beam
37After being in the magnetic field for a short time ∆t, how has the magnitude of the proton’s momentum changed?It has not changed
38Cyan: applied magnetic field. Green: conventional current What is the direction of magnetic torque?Clockwise
39Cyan: applied magnetic field. Green: conventional current What is the direction of magnetic torque?Counter Clockwise
40Cyan: applied magnetic field. Green: conventional current What is the direction of magnetic torque?Counter-Clockwise
41What is the direction of the magnetic field at the observation location "X" generated by the current. Note that the arrow shows the direction in which the electrons move.- z
42What is the direction of the magnetic field at the observation location "X"?+z
43A proton moving in the +y direction experiences a magnetic force in the –x direction. What is the direction of conventional current in the wire?+ y
44The image is a top view, looking down on the table. The compass is under the wire as shown. Which way does the needle of the compass point?8
45A wire lies on top of a compass. The image is top view, looking down on the table. The compass deflects 12 degrees West. What is the direction of the magnetic field due to the current in the wire, at the location of the compass?West
46What is the direction of force exerted on the top wire by the bottom wire?