A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 metres ?
(a) \( 0\ \mu\text{C}\,\text{m}^{-2} \)
(b) \( 5\ \mu\text{C}\,\text{m}^{-2} \)
(c) \( 20\ \mu\text{C}\,\text{m}^{-2} \)
(d) \( 8\ \mu\text{C}\,\text{m}^{-2} \)
Answer: (a) \( 0\ \mu\text{C}\,\text{m}^{-2} \)
\( \Phi_E = \frac{q_{\text{incl}}}{\varepsilon_0} \)
\( \vec{E} \cdot \vec{A} = 0 \)
\( E = 0 \)
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