A small ball with a mass of m = 36g suspended on an inextensible non-passing thread has a charge q1 = 6μC.

| February 14, 2021 | education

A small ball with a mass of m = 36g suspended on an inextensible non-passing thread has a charge q1 = 6μC. the second ball having a negative charge q2 = 5 μC is placed exactly under the first at a distance of L = 50 cm with the thread tension force.

Since the balls have different signs of charges, they will attract. The upper ball will be acted upon by the force of gravity Fт and the Coulomb force Fк from the side of the lower ball. The forces are directed downward, so they need to be summed up.
F = Ft + Fk.
Fт = mg, where m is the mass of the hanging ball, g is the acceleration of gravity.
Fк = kq₁q₂ / r², where k is the coefficient, q₁ and q₂ are the charges of the balls, r is the distance.
F = 0.036 kg * 9.8 m / s² + (9 * 10 ^ 9 N * m² / Kl²) * (6 * 10⁻⁶ * 5 * 10⁻⁶ Kl²) / (0.5² m²) = 0.35 H + 1.08 H = 1.43 N.
Answer: 1.43 N.



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