Directions for: The questions consist of two statements each, printed as assertion and reason. While answering these questions you are required to choose any one of the following five responses A. If both the Assertion and the Reason are true and the Reason is a correct explanation of the Assertion. B. If both the Assertion and the Reason are true but the Reason is not a correct explanation of Assertion. C. If the Assertion is true but the Reason is false. D. If both the Assertion and the Reason are false. E. If Assertion is false but Reason is true.
Assertion: Electric lines of force never cross each other. Reason: Electric field at a point superimpose to give one resultant electric field.A) A
B) B
C) C
D) D
E) E
Correct Answer: C
Solution :
Electric field lines of force can never intersect each other, because if they do so then at the point of intersection two tangents can be drawn which would mean two directions of force at that point which is impossible. If there are n point charges \[{{q}_{1}},{{q}_{2}}.........{{q}_{3}},\]then each of them will produce the same intensity at any point which it would have produced in the absence of other point- charges. Hence, intensity of \[\overrightarrow{\mathbf{E}}\] is resultant of \[{{\overrightarrow{\mathbf{E}}}_{1}},{{\overrightarrow{\mathbf{E}}}_{2}}........{{\overrightarrow{\mathbf{E}}}_{n}}\] as \[\overrightarrow{\mathbf{E}}={{\overrightarrow{\mathbf{E}}}_{1}}+{{\overrightarrow{\mathbf{E}}}_{2}}+...........+{{\overrightarrow{\mathbf{E}}}_{n}}\]
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