Four point charges −q,+q,+q and −q are placed on y− axis at y=−2d, y=−d, y=+d and y=+2d, respectively. The magnitude of the electric field E at a point on the x− axis at x=D, with D>>d, will behave as-

Four point charges −q,+q,+q and −q are placed on y− axis at y=�

1.	Four point charges −q,+q,+q and −q are placed on y− axis at y=−2d, y=−d, y=+d and y=+2d, respectively. The magnitude of the electric field E at a point on the x− axis at x=D, with D>>d, will behave as-
Answer» Four point charges $- q, + q, + q$ and $- q$ are placed on $y -$ axis at $y = - 2 d, y = - d, y = + d$ and $y = + 2 d,$ respectively. The magnitude of the electric field $E$ at a point on the $x -$ axis at $x = D,$ with $D >> d,$ will behave as-

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Four point charges −q,+q,+q and −q are placed on y− axis at y=−2d, y=−d, y=+d and y=+2d, respectively. The magnitude of the electric field E at a point on the x− axis at x=D, with D&gt;&gt;d, will behave as-

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Four point charges −q,+q,+q and −q are placed on y− axis at y=−2d, y=−d, y=+d and y=+2d, respectively. The magnitude of the electric field E at a point on the x− axis at x=D, with D>>d, will behave as-