Chapter 17: Electric Potential and Electric Energy; Capacitance
Physlet® Problems




1.  

The potential increases left to right in the above animation. Click-drag the 4 uC test charge and place it at various points inside the animation. Play the animation after you place the charge. What is the mass of the particle? You can measure the potential at any point by click-dragging the mouse. Distance is measured in meters and time in seconds. Start

1 gram.
2 gram.
3 gram.
4 gram.


2.  

The potential changes near the middle of the animation as shown by the equipotential lines. The black vector represents the particle's velocity. Click-drag to place the 1 uC test charge anywhere in the animation before you press play. You can also use the mouse to measure the potential at a point. What is the mass of the particle? Start

More Help: Show electric field.

1 gram.
2 gram.
3 gram.
4 gram.


3.  


An equipotential plot is shown above. How much work must an external force do in order to move an electron from [x,y]=[-0.5,-1.0] to [x,y]=[1.0,1.0]. Remember that you can measure the potential at any point by click-dragging the mouse. Start

Interactive Hint

More Help: Show electric field.

-1.1 x 10 -20 Joule.
-5.8 x 10 -20 Joule.
+1.1 x 10 -19 Joule.
-1.8 x 10 -20 Joule.


4.  

Question 17-4


Click on an answer to display an electric field plot in the right hand panel. The arrows in the field plot represent the direction and the colors represent the magnitude of the electric field. Which field plot best corresponds to the potential plot on the left hand side. You can click-drag in the left hand display to measure the potential.

Field a.
Field b.
Field c.
Field d.


5.  

Question 17-5


Click on an answer to display a potential plot in the right hand panel. The arrows in the field plot represent the direction and the colors represent the magnitude of the electric field. Which potential plot best corresponds to the field plot on the left hand side. You can click-drag in the right hand display to measure potential.

Field a.
Field b.
Field c.
Field d.


6.  


Two charged particles are shown. Find the charge on the left. You can measure the potential at any point by click-dragging the mouse. Distance is measured in m. Start

More Help: Show electric field.

20 nC
0.28 nC
36 nC
0.44 nC


7.  


Equipotential lines around a point charge are shown above. How much charge is located at the center? Distance is measured in m. Remember that you can measure the potential at a point by click-dragging the mouse. Start

More Help: Show electric field.

0.10 nC
0.15 nC
0.20 nC
0.25 nC


8.  


Find the dipole moment if distance is measured in cm. Remember that you can measure the potential at a point by click-dragging the mouse. Start

More Help: Show electric field.

0.5 x 10-13 Cm
1.0 x 10-13Cm
1.5 x 10-13 Cm
2 x 10-13


9.  


Two conducting plates are placed one above the other inside a metal box and connected to a battery as shown in the animation. The surrounding metal box is necessary for the calculation but unimportant for this discussion. The top plate can be moved by click-dragging near the center of the plate. You can measure the voltage by click-dragging away from the top plate. Which of the following statements is true? Start

More Help: Show electric field.

The energy required to move an electron from the red plate to the blue plate does not depend on the position of the blue plate.
The electric field between the blue and red plates is independent of the position of the blue plate.
The blue and red plates form a capacitor.  Their capacitance is independent of the position of the blue plate.
The energy stored between the two plates is independent of the position of the blue plate.

Physlets used by permission of Wolfgang Christian, Davidson College. Physlet Problems ©Prentice Hall, Inc; written by Aaron Titus (North Carolina State University) and Wolfgang Christian, Davidson College.


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