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Two concentric spherical shells of radius $R_1$ and $R_2$ have $q_1$ and $q_2$ charge respectively as shown in figure. How much charge will flow through key $k$ when it is closed
  • A${q_2}\,\left( {\frac{{{R_1} + {R_2}}}{{{R_2}}}} \right)$
  • B$\frac{{{q_1}{R_2} + {q_2}{R_1}}}{{{R_2}}}$
  • C${q_2}\,\left( {\frac{{{R_2} - {R_1}}}{{{R_2}}}} \right)$
  • D$\frac{{{q_1}{R_2} - {R_1}{q_2}}}{{{R_2}}}$
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