In figure a , a circular plastic rod with uniform charge+ Q produces an electric
ID: 2270231 • Letter: I
Question
In figure a, a circular plastic rod with uniform charge+Q produces an electric field of magnitude E atthe center of curvature (at the origin). In figures b,c, and d, more circular rods, each with identicaluniform charges +Q, are added until the circle iscomplete. A fifth arrangement (which would be labeled e)is like that in d except that the rod in the fourthquadrant has charge -Q.
In figure a, a circular plastic rod with uniform charge+Q produces an electric field of magnitude E atthe center of curvature (at the origin). In figures b,c, and d, more circular rods, each with identicaluniform charges +Q, are added until the circle iscomplete. A fifth arrangement (which would be labeled e)is like that in d except that the rod in the fourthquadrant has charge -Q. Rank the five arrangements according to the magnitude of the electric field at the center of curvature, greatest first (use only the symbols > or =, for example b=d>a=c>e).Explanation / Answer
e> b> a=c> d
because due to symmetry EF will cancel out at the centre in d so it will be zero in D