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Question

# Two point charges Q1 and Q2 of equal magnitude are placed at a certain distance from each other. Assuming the field strength to be positive in the positive direction of x-axis.The signs of the charges Q1 and Q2 for given graphs are :

A
+,+; +,; ,+; ,
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B
+,; +,+; ,+; ,
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C
,+; +,; +,+; ,
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D
+,+; +,; ,; ,+
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Solution

## The correct option is B +,−; +,+; −,+; −,−For graph (i), Q1,Q2 should be (+,−) respectively because the electric field everywhere ( also at the end points and midpoint) is pointing towards + x direction and at midpoint E≠0.For graph (ii), Q1,Q2 should be (+,+) respectively because the electric field at first end point is pointing towards +x direction and at 2nd end point is pointing towards -x direction and at midpoint E=0.For graph (iii), Q1,Q2 should be (−,+) respectively because the electric field everywhere (also at the end points and midpoint) is pointing towards - x direction and at midpoint E≠0.For graph (ii), Q1,Q2 should be (−,−) respectively because the electric field at first end point is pointing towards -x direction and at 2nd end point is pointing towards +x direction and at midpoint E=0.

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