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1

\( \mathrm{ABC} \) is a right angled triangle. Calculate the
\( \mathrm{P} \) magnitude of force on charge \( -Q \).

W
(1) \( \frac{K Q^{2} \sqrt{2}}{a^{2}} \)
(2) \( \frac{K Q^{2}}{a^{2}} \)
(3) \( \frac{K Q^{2}}{\sqrt{2} a^{2}} \)
(4) \( \frac{2 K Q^{2}}{a^{2}} \)
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