1. What is the sign of charge A in Figure 2? Explain why. 2. What is the sign of
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Question
1. What is the sign of charge A in Figure 2? Explain why.
2. What is the sign of charge B in Figure 2? Explain why.
3. What is the sign of charge C in Figure 2? Explain why.
4. What is the sign of charge D in Figure 2? Explain why.
5. Sketch the electric field lines on Fig 2. Each charge should have at least 4 lines starting at it or ending at it.
6. Where is the electric field stronger in Fig. 2: at the triangle or the square marker? Explain why.
triangle
square
The field has the same value at these points
Neither, since there is no electric field
7. Where is the electric field stronger in Fig. 2: at the triangle or the circle marker? Explain why.
triangle
circle
The field has the same value at these points
Neither, since there is no electric field
8. Where is the electric field stronger in Fig. 2: at the square or the circle marker? Explain why.
square
circle
The field has the same value at these points
Neither, since there is no electric field
I
II
III
There are no isolated charges indicated
10. What are the signs of these charges in Fig. 4?
positive and negative
negative and positive
Top is positive, bottom is negative
Top is negative, bottom is positive
There is no isolated charges indicated
11. In what region in Fig. 4 is the field the strongest?
I
II
III
The field is the same in all regions
12. In what region in Fig. 4 is the field the weakest?
I
II
III
The field is the same in all regions
13. In what region in Fig. 4 is the field the most uniform?
I
II
III
The field is the same in all regions.
Explanation / Answer
1. What is the sign of charge A in Figure 2?
Negative. Potential due to a negative charge alone will have negative value.
2. What is the sign of charge B in Figure 2?
Positive. Potential due to a positive charge will have positive value.
3. What is the sign of charge C in Figure 2?
Positive. Potential due to a positive charge will have positive value.
4. What is the sign of charge D in Figure 2?
Negative. Potential due to a negative charge will have negative value.
5. Sorry, not attempting the sketching part. Filed lines are directed towards the charge in case of a negative charge and are directed away from the charge in case of a positive charge. Hope that helps.
6. Where is the electric field stronger in Fig. 2: at the triangle or the square marker?
Triangle.
This is closest to the charge A. Electric field varies as inverse square of the separation between charge and the point at which we are measuring the field. Smaller the distance, greater the field value.
7. Where is the electric field stronger in Fig. 2: at the triangle or the circle marker?
Triangle
This is closest to the charge A. Electric field varies as inverse square of the separation between charge and the point at which we are measuring the field. Smaller the distance, greater the field value.
8. Where is the electric field stronger in Fig. 2: at the square or the circle marker?
Circle
This is closest to the charge B. Electric field varies as inverse square of the separation between charge and the point at which we are measuring the field. Smaller the distance, greater the field value.
9. In what region are the isolated charges in this diagram (fig. 4)?
There is no isolated charges indicated
10. What are the signs of these charges in Fig. 4?
There is no isolated charges indicated
11. In what region in Fig. 4 is the field the strongest?
II
12. In what region in Fig. 4 is the field the weakest?
III
13. In what region in Fig. 4 is the field the most uniform?
I
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