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Two non-conducting spheres of radii R1 and R2 and carrying uniform volume charge densities +roh and -roh, respectively, are placed such that the partially overlap, as shown in the figure. At all points in the overlapping region:
A) The electrostatic field is zero.
B) The electrostatic potential is constant.
C) The electrostatic field is constant in magnitude.
D) The electrostatic field has same direction.

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