Identical charges \( (-q) \) are placed at each corners of cube of side \( b \), then electrosta...

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Identical charges \( (-q) \) are placed at each corners of cube of side \( b \), then electrostatic potential energy of charge \( (+q) \) which is placed at centre of cube will be
(a) \( \frac{-4 \sqrt{2} q^{2}}{\pi \varepsilon_{0} b} \)
(b) \( \frac{-8 \sqrt{2} q^{2}}{\pi \varepsilon_{0} b} \)
(c) \( \frac{-4 q^{2}}{\sqrt{3} \pi \varepsilon_{0} b} \)
(d) \( \frac{8 \sqrt{2} q^{2}}{4 \pi \varepsilon_{0} b} \)
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