Question

Two parallel large non-conducting sheets with identical (positive) uniform surface charge densities and a sphere $A$ with a uniform (positive) volume charge density are arranged as shown in figure. Rank the points $1$ , $2$ , $3$ and $4$ according to the magnitudes of the net electric field in increasing order

• A. 1, 2, 3, 4
• B. 1 , 2 , 3 =4
• C. 1 = 2 , 3 , 4
• D. 4 , 3 , 2 , 1

Answer 1

Answer: (B)

The net electric field due to both sheets will be equal and opposite In direction so net electric field will be zero.
$\therefore$ Points which are near sphere will have max value of electric field.
Point $3$ and $4$ are at equal distance so electric field at $3$ and $4$ will be same.
Increasing order of electric field is $1,2,3=4$.