A positive point charge of 4.25 × 10⁻⁹ C creates an electric field. Calculate the field strength at a distance 7.6 × 10⁻² m and the force on a positive charged polymer bead of charge 2.1 × 10⁻⁹ C placed there.

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6.61 × 10³ N/C; 1.39 × 10⁻⁵ N away from the source E = kQ/r² = (8.99 × 10⁹ × 4.25 × 10⁻⁹) ÷ (7.6 × 10⁻²)². E = 6.61 × 10³ N/C, directed away from the positive source. Force F = qE. F = 2.1 × 10⁻⁹ × 6.61 × 10³ = 1.39 × 10⁻⁵ N away from the source.

Point-charge field acting on a charged polymer bead

A positive point charge of 4.25 × 10⁻⁹ C creates an electric field. Calculate the field strength at a distance 7.6 × 10⁻² m and the force on a positive charged polymer bead of charge 2.1 × 10⁻⁹ C placed there.

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