Electric Field Due to a Dipole Along the Equatorial Line
Two point cha...
Question
Two point charges +q and -q are held fixed at (-d, 0) and (d, 0) respectively of a (X,Y) coordinate system. Then
A
E at all points on the Y-axis is along ^i
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B
The electric field ˙Eat all points on the X - axis has the same direction
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C
Dipole moment is 2qd directed along ^i
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D
Work has to be done in bringing a test charge from infinity to the origin
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Solution
The correct option is AE at all points on the Y-axis is along ^i From figure, it is clear that ˙Eat all points on the y-axis is along ^i. Here ˙Eof 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 (a) is correct.