1. Two identical beads have mass m and charge q each. Just placed in a hemispherical basin of radius R with and without non-conductive walls friction, the beads move and balance in distance d between them. A) Determine the charge q of each bead. B) Determine the load thus required so that d becomes equal to 2R. (The acceleration of gravity g is assumed to be known.) m d R m

5. Point A is 40 cm north of a + 100 C point charge, and point B is 50 cm east of the charge as shown in the adjacent figure.(5 pts) A a. Determine V8 - VA b. How much external work would be required to move a +5 C from point A to point B. c. Determine EB - EA 100 C 40 cm 50 cm с B 30 CM

4. Examine the charge distribution shown 9₁ +4.0 x 105 C 4.0 m 9₂-4.0 x 105℃ 3.0 m N a) What will the net force be on a third charge of q3 = -5.0x10-5C, placed at point Z? b) What will the total electric potential energy be if a third charge of q3 = -5.0x10-5C is placed at point Z?

. A charge of +3.0 µC is distributed uniformly along the circumference of a circle with a radius of 20 cm. How much external energy is required to bring a charge of 25uC from infinity to the center of the circle? Select one: a. २.521 b. 8) C 3.375) 0. 2.53 e. 0.35)

A positive charge q = 1.5 C moves from A to B as shown. At point A, it has kinetic energy 15 J. What is its kinetic energy at point B, in Joules? Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

Write this in decimal format. Do not use scientific notation

ing W Point charges q = -4.00 nC and +4.00 nC are separated by distance 3.80 mm, forming an electric dipole. # 3 D E SP D So $ 4 R *** F - 96 5 T G 6 B Y ▾ Y Part A Find the magnitude of the electric dipole moment. Express your answer in coulomb meters to three significant figures. ▸ View Available Hint(s) H 95] ΑΣΦ Submit Part B. What is the direction of the electric dipole moment? Ofrom ₁ to q O from ₂ to g Submit Part C ■V VD] ΑΣΦ MacBook Air Request Answer 1 → C The charges are in a uniform electric field whose direction makes an angle 36.1 with the line connecting the charges. What is the magnitude of this field if the torque exerted on the dipole has magnitude 7.70x10-9 N-m ? Express your answer in newtons per coulomb to three significant figures. View Available Hint(s) N U 8 M 1 K ? ( 9 ? 22 C-m O O into a power outlet. P ? return

Two charged balls are hanging by threads as shown below: 5.0⁰ Each ball has a mass of 3.90 grams and a charge Q nC, and the length of each thread is 58.6 cm. For what value of Q will the masses be held in place? Assume units of nC = 10-⁹℃ for the charge and assume 3 significant digits.

True or False. The methods of charging a body are separation of charge, seduction, and induction.   Pulling a plastic comb through your hair creates a static charge by separation. Touch the comb to a piece of foil charges the foil using _______________

Ch 18 q3 In 1910 Rutherford performed a classic experiment in which he directed a beam of alpha particles at a thin gold foil. He unexpectedly observed a few of the particles scattered almost directly backward. This result was not consistent with then current models of atomic structure and led Rutherford to propose the existence of a very dense concentration of positive charge at the center of an atom—the atomic nucleus. The alpha particle has a charge of +2e and the gold nucleus a charge of +79e. Suppose that an alpha particle is initially a great distance from the gold, has a kinetic energy of 4.20 MeV (4.20  106 eV), and is headed directly at a gold nucleus. How close will the particle come to the center of the nucleus? Treat the nucleus and the alpha particle as point charges.