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Two concentric hollow metallic spheres of radii $r_1$ and $r_2 (r_1 > r_2)$ contain charges $q_1$ and $q_2$ respectively. The potential at a distance $x$ between $r_1$ and $r_2$ will be
  • A$\frac{{{q_1} + {q_2}}}{{4\pi {\varepsilon _0}x}}$
  • B$\frac{{{q_1}}}{{4\pi {\varepsilon _0}{r_1}}} + \frac{{{q_2}}}{{4\pi {\varepsilon _0}{r_2}}}$
  • C$\frac{{{q_1}}}{{4\pi {\varepsilon _0}x}} + \frac{{{q_2}}}{{4\pi {\varepsilon _0}{r_2}}}$
  • D$\frac{{{q_1}}}{{4\pi {\varepsilon _0}{r_1}}} + \frac{{{q_2}}}{{4\pi {\varepsilon _0}x}}$
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