Two point charges 
and 
are held fixed at 
and 
respectively of a 
coordinate system. Then
A
E at all points on the 
axis is along 
axis is along
B
The electric field 
at all points on the 
axis has the same direction
at all points on the axis has the same direction
C
Dipole moment is 
directed along 
directed along
D
Work has to be done in bringing a test charge from infinity to the origin
Text Solution
Verified by ExpertsThe correct answer is:
A
From figure, it is clear that 
at all points on the y-axis is along 
. Here 
of all points on x-axis cannot have the same direction. Here electric potential at origin is zero so no work is done in bringing a test charge from infinity to origin.
Here dipole moment is in – x direction (– q to +q). Hence only option is correct.
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