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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]

 
 
 
 
 


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]

 
 
 
 
 


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

 
 
 
 
 


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

 
 
 
 
 
 


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]

 
 
 
 
 
 


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]

 
 
 
 
 


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]

 
 
 
 
 


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]

 
 
 
 


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]

 
 
 
 


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

 
 
 


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

 
 
 
 


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

 
 
 


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

 
 
 
 


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]

 
 
 
 


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

 
 
 
 






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