Physics 12 - Quiz 2


Electric Fields and Forces

1. Indicate on each diagram below, using arrowheads, the direction of the electric field for the respective charge. (1 mark)

 

2.  Sketch the electric field that exists between, and around, each pair of charges. Use arrowheads to indicate direction.       (1 mark each)

 

 

 

 

 

3. Given the direction of the electric fields as shown below, indicate the direction that the electric force will act on the charged particle. (1 mark)

4. The diagram below shows two fixed charges separated by 1.0 m. One charge is twice the value of the other as indicated   (Q = 1.0 x 10-6 C). Using the diagram shown below, answer the following questions.

a) Determine the magnitude and direction of the electric field midway between the two charges.  (2 marks)

 

 

 

 

b) Determine the magnitude and direction of the force that each charge exerts on the other. (2 marks)

 

 

 

c) Determine the electric potential energy of the two charges. (2 marks)

 

 

 

 

d) How much work would be required from an external agent to move the +Q charge to within 0.5 m of the +2Q charge.     (3 marks)

 

 

 

 

 

e) If the +Q charge (m = 5.7 x 10-18 kg) were now released from this new position, what would be its velocity upon reaching the original separation distance of 1.0 m? (2 marks)

 

 

 

 

 

5. Three fixed charges are arranged at the vertices of a square as shown below. (Q = 1.0 x 10-6 C)

a) Determine the magnitude and direction of the electric field at position P. (4 marks)

 

 

 

 

 

b) Determine the magnitude and direction of the force that would be exerted on a -2Q charge, if it were placed at point P? (3 marks)

 

 

 

 

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