In the quark model of fundamental particles, a proton is composed of three-point particles called quarks: two “up” quarks, each having charge +e 2/3, and one down quark, having charge -e/3, where e is the charge on the proton. Suppose the three quarks are equidistant from each other on a triangle. Take the distance to be 1.32 x 10-15 m and calculate the total electric potential energy of the three-particle system.

Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 2.06 x 106 kg. The gravitational force that each sphere exerts on the other is balanced by the electric force. Determine the charge magnitude. FE 警

The diagram above shows a coaxial cable. The inner conductor has radius a = 0.0025 m. The outer conductor is a cylindrical shell with inner radius b = 0.0075 m, and outer radius c = 0.008 m from the center. Both conductors are coaxial. For every length L = 10 m of cable, there is a total charge q = 2.8e-08 C on the inner conductor and a total charge of Q = -5.6e-06 C on the outer conductor. Determine the electric potential difference between the labeled points A and B.

A helium nucleus is composed of two protons (positively charged) and two neutrons (charge neutral). The distance between the two protons in the nucleus is 5.18E-15 m. What is the electric force between the two protons (in Newtons; use positive sign for repulsive forces and negative sign for attractive forces)?

A charge, Q2 = -13.00x10-6 C, is 18.00 cm to the right of charge Q1 = 18.00x10-6 C. Where can a third charge be placed, along the line connecting Q1 and Q2, such that it experiences no net force? Give distances relative to Q1 and use a plus sign if the third charge is to the right of Q1.

What is the magnitude of the electric field at the location of the charge?

A  +3.00µC charge placed in an electric field experiences a force of  4.30 X 10 -3 N. What was the magnitude of the electric field  before the charge was placed there ?    (Ans: 1.40 X 10 3 N/C)

Two positive point charges Q and 2Q are separated by a distance R. If the charge Q experiences a force of magnitude F when the separation is R, what is the magnitude of the force on the charge 2Q when the separation is 2R ?

Four identical charged particles (q = +10.4 µC) are located on the corners of a rectangle as shown in the figure below. The dimensions of the rectangle are L = 61.2 cm and W = 15.7 cm. (a) Calculate the magnitude of the total electric force exerted on the charge at the lower left corner by the other three charges. N(b) Calculate the direction of the total electric force exerted on the charge at the lower left corner by the other three charges. ° (counterclockwise from the +x-axis)

Two point charges attract each other with an electric force of magnitude (F). If the charge on one of the particles (Q) is increased to (2Q) and the distance between the particles (d) is reduced to (d/2), what is the resulting magnitude of the electric force between them?