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Question: F * r² / (k * q1) q2 = 25N * (0.07m)² / (8.99*10^9 N*m²/C² * 2.3C)

It appears like you are looking to solve an equation for the Coulomb's law in Physics, which describes the force between two electrically charged objects. The formula is given by: F = k * |q1 * q2| / r², Where: - F is the magnitude of the force between the charges, - k is Coulomb's constant (approx. equal to 8.99 × 10⁹ N m²/C²), - q1 and q2 are the values of the charges, - r is the distance between the centers of the two charges. The equation which you have mentioned seems to be slightly rearranged. Looking at your equation, you want: |q2| = F * r² / (k * q1) Let's plug-in the values: |q2| = 25N * (0.07m)² / (8.99*10^9 N*m²/C² * 2.3C) To get: |q2| = 25N * 0.0049m² / (20.677 * 10^9 N*m²/C) On doing the math, you get: |q2| ≈ 5.9 * 10^-12 C Note that the absolute value notation |q2| is used because electric charge can be either positive or negative.

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