For the following electric field: Ē(x, y) = (x² + y²) + 2xyŷ Calculate the potential in the xy plane. Assume the potential at the origin equals to zero, meaning (0, 0) = 0. Select one: a. 4(x, y) = -2xy² 3 O b. 2-3 x(x,y) = = xy 3 O c. 4(x, y) = -x³-xy² ○ d. x3 x(x, y) = +xy² 3 Oe. (x, y) = x³ + xy² Of. 4(x, y) = xy² 3

A line of charge with uniform charge density lies along the x axis from x = a to x = a. a. What is the magnitude of the electric potential at (0, y)? b. How much work is necessary to move a particle with charge q from very far away to (0, y)?

A charged particle is moved in a uniform electric field between two points, A and B, as depicted in Figure P26.65. Does the change in the electric potential or the change in the electric potential energy of the particle depend on the sign of the charged particle? Consider the movement of the particle from A to B, and vice versa, and determine the signs of the electric potential and the electric potential energy in each possible scenario.

A Start with V=2k[(R2+x2)x] for the electric potential of a disk of radius R and excess surface charge density at a position x from the center of a disk on its axis, and derive an expression for the electric field at this position. Hint: See Example 24.6 (page 732) to check your answer.

(a) What is the potential between two points situated 10 cm and 20 cm from a 3.0C point charge? (b) To what location should the point at 20 cm be moved to increase this potential difference by a factor of two?

(a) A sphere has a surface uniformly charged with 1.00 C. At what distance from its center is the potential 5.00 MV? (b) What does your answer imply about the practical aspect of isolating such a large charge?

Figure P26.71 shows three charged particles arranged at the vertices of an isosceles triangle with base b = 1.00 m. What is the electric potential due to the particles at point P, which is at the midpoint of the base? FIGURE P26.71

A uniformly charged ring with total charge q = 3.00 C and radius R = 10.0 cm is placed with its center at the origin and oriented in the xy plane. What is the difference between the electric potential at the origin and the electric potential at the point (0, 0, 30.0 cm)?

A particle with charge +q is at the origin. A particle with charge 2q is at x = 2.00 m on the x axis. (a) For what finite value(s) of x is the electric field zero? (b) For what finite value(s) of x is the electric potential zero?

Two 5.00-nC charged particles are in a uniform electric field with a magnitude of 625 N/C. Each of the particles is moved from point A to point B along two different paths, labeled in Figure P26.65. a. Given the dimensions in the figure, what is the change in the electric potential experienced by the particle that is moved along path 1 (black)? b. What is the change in the electric potential experienced by the particle that is moved along path 2 (red)? c. Is there a path between the points A and B for which the change in the electric potential is different from your answers to parts (a) and (b)? Explain. FIGURE P26.65 Problems 65, 66, and 67.