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. The electric field $\overrightarrow{E}$ at all points on the x-axis has the same direction
• B. $\overrightarrow{E}$ at all points on the Y-axis is along $\overrightarrow{i}$
• C. Work has to be done in bringing a test charge from infinity to the origin slowly.
• D. The dipole moment is 2qd directed along $\overrightarrow{i}$

Answer 1

The correct option is B $\overrightarrow{E}$ at all points on the Y-axis is along $\overrightarrow{i}$

$\begin{array}{c}alongx-axis\overrightarrow{E}hassamedirectioneverywhere\\ exceptwithin-dtod\\ also,\\ alongy-axis\overrightarrow{E}isalong\overrightarrow{i}\\ Hence,theoptionBisthecorrectanswer.\end{array}$