Two charged spheres of radius $R_1$ and $R_2$ respectively are charged and joined by a wire. The ratio of the electric field at the surfaces of the spheres is . . . . . . .

  • A
    $\frac{R_2}{R_1}$
  • B
    $\frac{R_1}{R_2}$
  • C
    $\frac{R_2^2}{R_1^2}$
  • D
    $\frac{R_1^2}{R_2^2}$

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