An electric charge \( +q \) is placed at the centre of a cube of side \( a \). The electric flux on one of its faces will be
(a) \( \frac{q}{6 \varepsilon_{0}} \)
(b) \( \frac{q}{\varepsilon_{0} q^{2}} \)
(c) \( \frac{q}{4 \pi \varepsilon_{0} a^{2}} \)
(d) \( \frac{q}{\varepsilon_{0}} \)
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