2. Ms. Kallinkos explained to her class that the interaction force of two charges is given by Coulomb's Law. The formula for Coulomb's Law is shown. This states that energy is related to the charges and the distance between them, where q₁ and q2 are the charges on the ions and r is the distance between them. The symbol k in Coulomb's law is a constant. The diagrams below show the relationship between unlike particles. Time 9₁ F F 92 She provides the class with a table that describes of a pair of charged particles in an electric field whose separation changes over time. Description of Charged Particles A B C kq,9₂ F= Like charges repel Unlike charges attract Charge of Particle 1 +1 +1 +1 Charge of Particle 2 +1 +1 +1 Distance between Particles 1 and 2 (nm) 150 200 50 How does the potential energy stored in the electric field change from time A to time C? A The potential energy increases from time A to time B to time C. B The potential energy decreases from time A to time B to time C. C The potential energy increases from time A to time B and decreases from time B to time C. D The potential energy decreases from time A to time B and increases from time B to time C.

2. Ms. Kallinkos explained to her class that the interaction force of two charges is given by Coulomb's Law. The formula for Coulomb's Law is shown. This states that energy is related to the charges and the distance between them, where q₁ and q2 are the charges on the ions and r is the distance between them. The symbol k in Coulomb's law is a constant. The diagrams below show the relationship between unlike particles. Time 9₁ F F 92 She provides the class with a table that describes of a pair of charged particles in an electric field whose separation changes over time. Description of Charged Particles A B C kq,9₂ F= Like charges repel Unlike charges attract Charge of Particle 1 +1 +1 +1 Charge of Particle 2 +1 +1 +1 Distance between Particles 1 and 2 (nm) 150 200 50 How does the potential energy stored in the electric field change from time A to time C? A The potential energy increases from time A to time B to time C. B The potential energy decreases from time A to time B to time C. C The potential energy increases from time A to time B and decreases from time B to time C. D The potential energy decreases from time A to time B and increases from time B to time C.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter19: Electric Potential And Electric Field

Section: Chapter Questions

Problem 17CQ: How does the polar character of water molecules help to explain waters relatively large dielectric...

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How does the polar character of water molecules help to explain waters relatively large dielectric constant? (Figure 19.19) Figure 19,19 Artist's conception of a water molecule. There is an inherent separation of charge, and so water is a polar molecule. Electrons in the molecule are attracted to the oxygen nucleus and leave an excess of positive charge near the two hydrogen nuclai. (Note that the schematic on the right is a rough illustration of the distribution of electrons in the water molecule. It does not show the actual numbers of protons and elections involved in the structure.)
To form a helium atom, an alpha particle that contains two protons and two neutrons is fixed at one location, and two electrons are brought in from far away, one at a time. The first electron is placed at 0.6001010 m from the alpha particle and held there while the second electron is brought to 0.6001010 m from the alpha particle on the other side from the first electron. See die final configuration below, (a) How much work is done in each step? (b) What is the electrostatic energy of die alpha particle and two electrons in the final configuration?
Review. Two insulating spheres have radii r1 and r2, masses m1 and m2, and uniformly distributed charges q1 and q2. They are released from rest when their centers are separated by a distance d. (a) How fast is each moving when they collide? (b) What If? It the spheres were conductors, would their speeds be greater or less than those calculated in part (a)? Explain.
In different experimental trials, an electron, a proton, or a doubly charged oxygen atom (O--), is fired within a vacuum tube. The particle's trajectory carries it through a point where the electric potential is 40.0 V and then through a point at a different potential. Rank each of the following cases according to the change in kinetic energy of the particle over this part of its flight from the largest increase to the largest decrease in kinetic energy. In your ranking, display any cases of equality, (a) An electron moves from 40.0 V to 60.0 V. (b) An electron moves front 40.0 V to 20.0 V. (c) A proton moves from 40.0 V to 20.0 V'. (d) A proton moves from 40.0 V to 10.0 V. (e) An O-- ion mines from 40.0 V to 60.0 V.
An eccentric inventor attempts to levitate by first placing a large negative charge on himself and then putting a large positive charge on the ceiling of his workshop. Instead, while attempting to place a large negative charge on himself, his clothes fly off. Explain.
A charge of 36.3 nC is transferred to a neutral copper ball of radius 4.35 cm. The ball is not grounded. The excess electrons spread uniformly on the surface of the ball. What is the number density (number of electrons per unit surface area) of excess electrons on the surface of the ball?
Suppose Earth and the Moon each carried a net negative charge Q . Approximate both bodies as point masses and point charges. (a) What value of Q is required to balance the gravitational attraction between Earth and the Moon? (b) Does the distance between Earth and the Moon affect your answer? Explain. (c) How many electrons would be needed to produce this charge?
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