7. A uniformly charged insulating rod of length 14.0 cm is bent into the shape of a semicircle as shown in Figure 5. The rod has a total charge of Q = -7.5µC. Find the electric potential at 0, the center of the semicircle. R

1. What is a correct expression for the potential energy of the charge configuration illustrated below? Assume the sphere (of radius R) is uniformly charged. C b 92 kQq kQq, kq,q, А. + + R+а R+b kQq kQq, kq 42 + В. (R+а)? (R+b)? kQq,, kQq, , kq,q, C. + + b a kQq D. a? kq 92 + kQq,, kQq, + ? a Е.

Find an expression for Electric Potential differences formed by a semicircle charged rod with a total charge of 50 micro.C at the center of a semicircle with a radius of R= 30.0 cm.

14. The plates of a parallel-plate capacitor are 4.50 mm apart, and each carries a charge of magnitude 85.0 nC. The plates are in vacuum. The electric field between the plates has a magnitude of. What is the potential difference in Volts between the plates? Write the answer in whole number.

You place a particle of charge q at the origin and another of -2q at x = -d m. a. Write an expression for the potential at some arbitrary distance xp from the origin on the x axis. b. Similar to a), write an expression for the electric field anywhere along x axis. ) A thin wire carries uniform charge q and is shaped into a circle of radius R. a. What is the magnitude of the electric field at the center of the circle? (Hint: this one should be quick!) b. What is the value of the potential (referenced to 0 at infinity) at the center? ) Consider an infinitely long cylinder with radius R and uniform surface charge density o. a. Find the magnitude of the electric field at a distance s from the axis of the cylinder for s R. c. Using your answer to part b, find the potential difference between two points: s= a and s = b. A thin rod of length 1 carries a uniformly distributed charge q. The rod lies on the x axis with its near end at x = +d and the far end of the rod at x = d+l. a. What is the…

3 A 0.500 cm diameter plastic sphere, used in a static electricity demonstration, has a uniformly distributed 39.0 pC charge on its surface. What is the potential near its surface?   This is not and will not be graded

3. A capacitor with no dielectric material between the plates has a potential difference of 19V across it. The plates are separated by 3.7 mm. If the plates each hold charges of ±4.27nC: a. What is the capacitance? b. What is the area of each plate? c. What is the electric field between the plates? d. What is the energy stored in the capacitor? The power supply is disconnected leaving the +4.27nC trapped on each plate. The plates are then pulled apart to a separation of 6.0 mm: e. What is the new capacitance? f. What is the new potential difference between the plates?

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A solid metal sphere has a charge of -80μC and radius of 0.75 m.  What is the electric field and absolute electric potential at different distances, r, from the center of the sphere?  The + direction is away from the sphere. Include a sketch of the electric force vectors you use to set up your equations

I need help for these questions, I am studying for the physics exam and I couldn't solve this questions which are in the study plan of physics-102. Thanks in advance.