Abington Heights High School
AP Physics
Electrostatics Practice Quiz 4
Select the answer that best completes the question.
1.
Five particles are shot from the left into a region that contains a uniform electric field. The numbered lines show the paths taken by the five particles. A negatively charged particle with a charge -3Q follows path 2 while it moves through this field.
R-1 Ref 18-2

In which direction does the electric field point?
A.toward the top of the page
B.toward the left of the page
C.toward the right of the page
D.toward the bottom of the page
E.out of the page, toward the reader

2.
Five particles are shot from the left into a region that contains a uniform electric field. The numbered lines show the paths taken by the five particles. A negatively charged particle with a charge -3Q follows path 2 while it moves through this field.
R-1 Ref 18-2

Which path would be followed by a helium atom (an electrically neutral particle)?
A.path 1
B.path 2
C.path 3
D.path 4
E.path 5

3.
Five particles are shot from the left into a region that contains a uniform electric field. The numbered lines show the paths taken by the five particles. A negatively charged particle with a charge -3Q follows path 2 while it moves through this field.
R-1 Ref 18-2

Which path would be followed by a charge +6Q?
A.path 1
B.path 2
C.path 3
D.path 4
E.path 5

4. What is the magnitude of the electric field due to a 4.0 ´ 10-9 C charge at a point 0.020 m away?
A.1.8 ´ 103 N/C
B.9.0 ´ 104 N/C
C.1.0 ´ 105 N/C
D.3.6 ´ 106 N/C
E.7.2 ´ 107 N/C
5.
The figure shows a parallel plate capacitor. The surface charge density on each plate is 8.8 ´ 10-8 C/m2. The point P is located 1.0 ´ 10-5 m away from the positive plate.
R-2 Ref 18-3

Which one of the following statements concerning the direction of the electric field between the plates is true?
A.It points to the left.
B.It points to the right.
C.It points toward the negative plate.
D.It points toward the positive plate.
E.It points up out of the plane of the page.

6.
The figure shows a parallel plate capacitor. The surface charge density on each plate is 8.8 ´ 10-8 C/m2. The point P is located 1.0 ´ 10-5 m away from the positive plate.
R-2 Ref 18-3

What is the magnitude of the electric field at the point P.
A.8.8 N/C
B.88 N/C
C.100 N/C
D.880 N/C
E.10 000 N/C

7.
The figure shows a parallel plate capacitor. The surface charge density on each plate is 8.8 ´ 10-8 C/m2. The point P is located 1.0 ´ 10-5 m away from the positive plate.
R-2 Ref 18-3

If a +2.0 ´ 10-5 C point charge is placed at P, what is the force exerted on it?
A.0.2 N, toward the negative plate
B.0.2 N, toward the positive plate
C.5 ´ 104 N, toward the positive plate
D.5 ´ 104 N, toward the negative plate
E.5 ´ 104 N, into the plane of the page

8. A small sphere of mass 1.0 ´ 10-6 kg carries a total charge of 2.0 ´ 10-8 C. The sphere hangs from a silk thread between two large parallel conducting plates. The excess charge on each plate is equal in magnitude, but opposite in sign. If the thread makes an angle of 30° with the positive plate as shown, what is the magnitude of the charge density on each plate?

A.2.5 ´ 10-9 C/m2
B.5.2 ´ 10-9 C/m2
C.1.0 ´ 10-9 C/m2
D.2.1 ´ 10-8 C/m2
E.4.2 ´ 10-8 C/m2
9. Complete the following statement: The magnitude of the electric field at a point in space does not depend upon
A.the distance from the charge causing the field.
B.the sign of the charge causing the field.
C.the magnitude of the charge causing the field.
D.the force that a unit positive charge will experience at that point.
E.the force that a unit negative charge will experience at that point.
10. Four point charges are placed at the corners of a square as shown in the figure. Each side of the square has length 2.0 m. Determine the magnitude of the electric field at the point P, the center of the square.

A.2.0 ´ 10-6 N/C
B.3.0 ´ 10-6 N/C
C.9.0 ´ 103 N/C
D.1.8 ´ 104 N/C
E.2.7 ´ 104 N/C
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