A spherical condenser has \( 10 \mathrm{~cm} \) and \( 12 \mathrm{~cm} \) as the radii of inner ...

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A spherical condenser has \( 10 \mathrm{~cm} \) and \( 12 \mathrm{~cm} \) as the radii of inner and outer spheres. The space between the two is filled with a dielectric of dielectric constant 3. Find the capacity when the inner sphere is earthed.
\( P \)
W.
(A) \( \frac{15}{32} \times 10^{-10} \mathrm{~F} \)
(B) \( \frac{32}{15} \times 10^{+10} \mathrm{~F} \)
(C) \( \frac{32}{15} \times 10^{-9} \mathrm{~F} \)
(D) \( \frac{32}{15} \times 10^{-10} \mathrm{~F} \)
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