College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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When combing your hair, you scuff electrons from your hair onto the comb. Is your hair then positively or negatively charged? How about the comb?
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- 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 5.44 MeV (5.44 x 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.arrow_forwardTwo charges are located along the x-axis. One has a charge of 6.4 µC, and the second has a charge of -3.4 µC. if the electrical potential energy associated with the pair of charges is -3.8 x 10 -2 J, what is the distance between the charges?arrow_forwardThree charges, q, are sitting on three corners of a square of side a, at points (0,0), (0, a), (a,0). How much work does it take to bring in another identical charge and place it at the point (a, a)? How much work does it take to assemble the entire square?arrow_forward
- Two small balls with a mass of 2 g each are hanging on two separate strings 0.5 m (50 cm) long attached to a common point. They are given an identical negative charge and spread apart to a distance 6 cm from each other.arrow_forwardTwo identical point charges, P and Q, separated by a distance r, repel each other with a force F. If r is increased so that the electrical potential energy of Q is halved, what is the force of repulsion? ABCD ½ F F 2 F 14 Farrow_forwardHow much energy is stored by the electric field between two square plates, 9.1 cm on a side, separated by a 2.3-mm air gap? The charges on the plates are equal and opposite and of magnitude 15 nC. Express your answer using two significant figures and include the appropriate units. PE = Value Units Submit Request Answer * Previous Next 15:10 hp W 27/03/2022 2000 hp f6 4 f11 10 F12 f10 f7 II f5 f8 f9 insert prt sc ( 9- ) 0 & -backspa // 大 t6arrow_forward
- Determine an expression for the E field at a point that is a distance d from both charges. Express your answer in terms of the variables k, q, and d.arrow_forwardCalculate the amount of work required to bring together the three given charges from infinity to the corners of an equilateral triangle of side length 1cm? q1=1μC, q2=2μC, q3=3Μcarrow_forwardThe amount of work needed to bring together four identical point charges of 32.7 uC to each corner of a square with side 6.4 cm is equal to ____ J.arrow_forward
- When you rub a balloon on your hair, it picks up a net charge. However the voltage produced is around 5000V. If you touch the balloon with your finger, you aren't in danger of a painful shoch. Explain whyarrow_forwardGiven two particles with Q = 2.80-μC charges as shown in the figure below and a particle with charge q = 1.27 x 10-18 C at the origin. (Note: Assume a reference level of potential V = 0 at r = ∞o.) 9 x = -0.800 m 0 x = 0.800 m x (a) What is the net force (in N) exerted by the two 2.80-μC charges on the charge q? (Enter the magnitude.) N (b) What is the electric field (in N/C) at the origin due to the two 2.80-μC particles? (Enter the magnitude.) N/C (c) What is the electrical potential (in kV) at the origin due to the two 2.80-μC particles? kv (d) What If? What would be the change in electric potential energy (in J) of the system if the charge q were moved a distance d = 0.400 m closer to either of the 2.80-μC particles? Jarrow_forwardA point charge of 33 uC is placed at a distance of 36 cm from another identical charge. A charge of -1.5 uC is transferred from point a to point b as shown in the figure. Determine: a) The change in electrical potential energy b) If the -1.5 uC charge has an initial velocity of zero. What is its final velocity if it has a mass of 5.0 x 10-15 kg?arrow_forward
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