Question

Touch and Go. Three identical conducting spheres denoted as X, Y, and Z are separated in space. They have initial net charges of -2Q, -3Q, and 5Q, respectively. Sphere Z is touched to X and separated, then touched to Y and separated. Upon reaching electrostatic equilibrium, what is the final net charge of Y? Sheets. Three infinite sheets of uniform surface charge densities of +σ, +σ, and -σ are arranged as shown: What is the magnitude and direction of the electric field at region III? a. σ / 2ε0 b. 0 c. 3σ / 2ε0 d. σ / ε0 A semi-circular rod of radius R contains a positive charge +Q. The field point P is situated at the center of curvature of the semi-circle. In terms of k, Q, and R, what is the magnitude and direction of the electric field at point P?

          Touch and Go. Three identical conducting spheres denoted as X, Y, and Z are separated in space. They have initial net charges of -2Q, -3Q, and 5Q, respectively. Sphere Z is touched to X and separated, then touched to Y and separated. Upon reaching electrostatic equilibrium, what is the final net charge of Y?

Sheets. Three infinite sheets of uniform surface charge densities of +σ, +σ, and -σ are arranged as shown: What is the magnitude and direction of the electric field at region III? 

a. σ / 2ε0
b. 0
c. 3σ / 2ε0
d. σ / ε0

A semi-circular rod of radius R contains a positive charge +Q. The field point P is situated at the center of curvature of the semi-circle. In terms of k, Q, and R, what is the magnitude and direction of the electric field at point P?

Added by Sergio G.

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