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A charge \( +q \) is placed at the origin \( O \) of \( x-y \) axes as shown in the figure. The work done in taking a charge \( Q \) from \( A \) to \( B \) along the straight line \( A B \) is
\( \mathrm{P} \)
(a) \( \frac{q Q}{4 \pi \varepsilon_{0}}\left(\frac{a-b}{a b}\right) \)
(b) \( \frac{q Q}{4 \pi \varepsilon_{0}}\left(\frac{b-a}{a b}\right) \)
(c) \( \frac{q Q}{4 \pi \varepsilon_{0}}\left(\frac{b}{a^{2}}-\frac{1}{b}\right) \)
(d) \( \frac{q Q}{4 \pi \varepsilon_{0}}\left(\frac{a}{b^{2}}-\frac{1}{b}\right) \)
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