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Four point charges q,q,-q,-q are held fixed at the corners of square ABCD with diagonals of length 2l. Determine the field intensity at a point distance x from the plane of the square on its axis.

 
Four point charges q,q,-q,-q are held fixed at the corners of square ABCD with diagonals of length 2l. Determine the field intensity at a point distance x from the plane of the square on its axis.

Grade:12

7 Answers

Saurabh Kumar
askIITians Faculty 2411 Points
6 years ago
ELECTRIC FIELD WOULD BE DIRECTED VERTICALLY UPWARD...
Calculate the vertical component of individuals (3 positive charge) as cancelled by other fourth negative charge..
Find the resultant and get the answer..
Zunaid Sorathiya
15 Points
6 years ago
sir not understand how three positive charges ??
 
Satviki Pathak
40 Points
6 years ago
I guess the answer is zero...the vertical components of the two positive and negative charges should cancel out...
Satviki Pathak
40 Points
6 years ago
and the horizontal components as well cancel out i guess..
 
Satviki Pathak
40 Points
6 years ago
no wait the vertical components will cancel out and the horizontal wont....
Zunaid Sorathiya
15 Points
6 years ago
No satviki its not Zero ... given ans : k2(2)1/2ql/(l2+x2)3/2
grenade
2061 Points
6 years ago
consider charges on a square and then mark the direction of forces b/w two of the charges one from the squrae and other of the out of plane and then take out the resultants
thus u will find that the verticals are cancelled the then take out the final anser 

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