There are two nonconducting spheres having uniform volume charge densities `rho` and `- rho` . Both spheres have equal radius `R`. The spheres are now laid down such that they overlap as shown in Fig.2.125. Take `vec(d) = O_(1) vec(O_(2))`.
The electric field `vec(E)` in the overlapped region is
A. nonuniform
B. zero
C. `(rho)/( 3 epsilon_(0)) vec(d)`
D. `(-rho)/( 3 epsilon_(0)) vec(d)`