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Question
Figure shows the electric field lines around three point charges A, B and C.
- Which charges are positive?
- Which charge has the largest magnitude? Why?
- In which region or regions of the picture could the electric field be zero? Justify your answer.
(i) near A, (ii) near B, (iii) near C, (iv) nowhere.
Solution
- Charges A and C are positive since lines of force emanate from them
- Charge C has the largest magnitude since the maximum number of field lines is associated with it.
- (i) near A. There is no neutral point between a positive and a negative charge. A neutral point may exist between two like charges. From the figure we see that a neutral point exists between charges A and C. Also between two like charges, the neutral point is closer to the charge with a smaller magnitude. Thus, electric field is zero near charge A.
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