Home > Electric Charge, Forces, and Fields > Practice Questions 2 >

 Electric Charge, Forces, and Fields Practice Questions 2

1 .
In the above figure, if Q1 is negative and has magnitude less than Q2 which is positive, where could a positive charge be placed and possibly have a zero net force on it? [Hint]

 A B C D E

2 .
In the above figure, if Q1 and Q2 are positive, where could a negative charge be placed and have a vertically upward net force on it? [Hint]

 A B C D E

3 .
In the above figure, if Q1 and Q2 are positive, where would the electric field be vertically upward ? [Hint]

 A B C D E

4 .
In the above figure, if Q1 and Q2 are positive and the same size, where would the electric field be zero ? [Hint]

 A B C D E Not shown.

5 .
In the above figure, if Q1 is negative and Q2 is positive and are both the same magnitude, where would the electric field be zero ? [Hint]

 A B C D E Nowhere shown.

6 .
In the above figure, if Q1 is negative and Q2 is positive and the distance from Q2 to point C is 1/4 the distance between the charges, how many times greater than Q2 in magnitude must Q1 be for the electric field to be zero at C? [Hint]

 4 10 16 20 25

7 .
In the above figure if the vertical distance from point E to B is the same as the horizontal distance from E to either charge and the electric field at B from either charge has magnitude 1.0x106, what is the magnitude of the net electric field? [Hint]

 zero 7.1x105 1.0x106 1.4x106 2.0x106

8 .
In the above figure the vertical distance from point E to B is the same as the horizontal distance from E to either charge and the electric field at B from either charge has magnitude 1.0x106. If Q1 is negative and Q2 is positive what is the direction of the net electric field at B? [Hint]

 Vertical and up. Horizontal and to the right. Vertical and down. Horizontal and to the left.

9 .
In the above figure the vertical distance from point E to B is the same as the horizontal distance from E to either charge and the electric field at B from either charge has magnitude 1.0x106. If both Q1 and Q2 are positive what is the direction of the net electric field at B? [Hint]

 Vertical and up. Horizontal and to the right. Vertical and down. Horizontal and to the left.

10 .
The figure above shows a metal shell surrounding a positive charge. What is the charge on the metal surface at b? [Hint]

 negative zero positive

11 .
The figure above shows a metal shell surrounding a positive charge. Which of the following statements is true? [Hint]

 The electric field at e is less than that at a and c. The electric field at c is greater than that at a and e. The electric field at c is less than that at a and e. The electric field at e is greater than that at a.

12 .       In question 10 what would be the charge on the exterior surface (d)? [Hint]

 negative zero positive

13 .       Four people tell you they have a negative charge of a certain value. Which one is not telling the truth? [Hint]

 Mine is 1.90x10-18 Coulomb. Mine is 1.6x10-18 Coulomb. Mine is 1.92x10-18 Coulomb. Mine is 2.4x10-16 Coulomb.

14 .       What must be the charge on each of two 100 kg spherical masses in order for the electrical force to equal the gravitational force? [Hint]

 8.6x10-19 C 8.6 nanoC 7.4x10-17 C 100 C

15 .       How many electrons would it take to make up a charge of minus one millionth of a Coulomb? [Hint]

 100000 10000000 8x1042 6.25x1012

 Copyright © 1995-2010, Pearson Education, Inc., publishing as Pearson Prentice Hall Legal and Privacy Terms