Two metallic charged spheres whose radii are $20\,cm$ and $10\,cm$ respectively, have each $150\,micro - coulomb$ positive charge. The common potential after they are connected by a conducting wire is
Two metallic charged spheres whose radii are $20\,cm$ and $10\,cm$ respectively, have each $150\,micro - coulomb$ positive charge. The common potential after they are connected by a conducting wire is
- A
$9 \times {10^6}\;volts$
- B
$4.5 \times {10^6}\;volts$
- C
$1.8 \times {10^7}\;volts$
- D
$13.5 \times {10^6}\;volts$
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