Final answer:
The electrical force of attraction between two charged objects can be calculated using Coulomb's Law. In this case, the electrical force of attraction between the two balloons with charges of +3.5 x 10-8 C and -2.9 x 10-8 C, separated by a distance of 0.65 m, is approximately -8.997 N.
Step-by-step explanation:
The electrical force of attraction between two charged objects is calculated using Coulomb's Law. Coulomb's Law states that the force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
Using the given charges of +3.5 x 10-8 C and -2.9 x 10-8 C and the distance of 0.65 m, we can calculate the electrical force of attraction:
Electric force = (k * (q1 * q2)) / r2
where k is the Coulomb's constant, q1 and q2 are the charges, and r is the distance between the charges.
Plugging in the values, we get:
Electric force = (8.99 x 109 N m2/C2) * ((3.5 x 10-8 C) * (-2.9 x 10-8 C)) / (0.65 m)2
The electrical force of attraction between the two balloons is approximately -8.997 N.