Can some help me find the elctrostatic force exerted in this problem please?

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To find the electrostatic force between a charge of 5.30 x 10^-9 C and a charge of -3.50 x 10^-9 C located 4.0 m apart, the formula F = k * |q1 * q2| / r^2 is used, where k is Coulomb's constant (approximately 8.99 x 10^9 N m²/C²). The calculation involves substituting the values into the formula to determine the force's magnitude. Participants encourage the user to share their initial attempts and clarify where they are struggling for more tailored assistance. Engaging with the community can provide additional insights and support in solving the problem.
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Can some help me find the elctrostatic force exerted in this problem please?

A charge of 5.30 10-9 C is located 4.0 m from a charge of -3.50 10-9 C. Find the magnitude of the electrostatic force exerted by one charge on the other.
 
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