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.