A combination of capacitors is set up as shown in P the figure. The magnitude of the electric fi...

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A combination of capacitors is set up as shown in
P
the figure. The magnitude of the electric field, due
W
to a point charge \( \mathrm{Q} \) (having a charge equal to the sum of the charges on the \( 4 \mu F \) and \( 9 \mu F \) capacitors), at a point distant \( 30 \mathrm{~m} \) from it, would equal:
(A) \( 360 \mathrm{~N} / \mathrm{C} \)
(B) \( 420 \mathrm{~N} / \mathrm{C} \)
(C) \( 480 \mathrm{~N} / \mathrm{C} \)
(D) \( 240 \mathrm{~N} / \mathrm{C} \)
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