$A$ spherical conductor of radius $10 \, cm$ has a charge of $3.2 \times 10^{-7} \, C$ distributed uniformly. What is the magnitude of the electric field at a point $15 \, cm$ from the centre of the sphere?
$\left(\frac{1}{4 \pi \epsilon_{0}} = 9 \times 10^{9} \, Nm^{2}/C^{2}\right)$
$\left(\frac{1}{4 \pi \epsilon_{0}} = 9 \times 10^{9} \, Nm^{2}/C^{2}\right)$
- A$1.28 \times 10^{7} \, N/C$
- B$1.28 \times 10^{4} \, N/C$
- C$1.28 \times 10^{5} \, N/C$
- D$1.28 \times 10^{6} \, N/C$
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