Electric Potential-problems

# Electric Potential-problems - yang(jy6223 Electric...

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yang (jy6223) – Electric Potential – mostarshed – (338-A1) 1 This print-out should have 32 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points Two alpha particles (helium nuclei), each consisting oF two protons and two neu- trons, have an electrical potential energy oF 6 . 18 × 10 19 J . Given: k e = 8 . 98755 × 10 9 N m 2 / C 2 , q p = 1 . 6021 × 10 19 C , and g = 9 . 8 m / s 2 . What is the distance between these parti- cles at this time? Answer in units oF m. 002 10.0 points In a charging process, 4 × 10 13 electrons are removed From one metal sphere and placed on a second sphere. Initially both metal spheres were neutral. AFter the charging process the electrical potential energy associated with the two spheres is Found to be 0 . 06 J . What is the distance between the two spheres? The value oF the Coulomb constant is 8 . 98755 × 10 9 N · m 2 / C 2 and the elemental charge is 1 . 6 × 10 19 C . Answer in units oF m. 003 10.0 points A test charge + q is brought to a point A a distance r From the center oF a sphere having a net charge + Q . Next, a test charge +3 q is brought to a point B a distance 3 r From the center oF the sphere. Compared with the electrostatic potential at A , the electrostatic potential at B is 1. smaller. 2. greater. 3. the same. 004 10.0 points The potential di±erence between a storm cloud and the ground is 2 . 28 × 10 8 V. IF a bolt carrying 3 C Falls From a cloud to Earth, what is the change oF potential energy oF the charge? Answer in units oF J. 005 (part 1 of 2) 10.0 points An object with a charge 5 C and a mass 0 . 5 kg accelerates From rest to a speed oF 20 m / s. Calculate the kinetic energy gained. Answer in units oF J. 006 (part 2 of 2) 10.0 points Through how large a potential di±erence did the object Fall? Answer in units oF V. 007 (part 1 of 2) 10.0 points A long cylindrical insulator has a uniForm charge density oF 1 . 48 μ C / m 3 and a radius oF 4 cm . 4 cm 2 cm What is the electric feld inside the insulator at a distance oF 2 cm? Answer in units oF N / C. 008 (part 2 of 2) 10.0 points How much work must you do to bring a q = 0 . 072 μ C test charge From 10 cm to 2 cm? Answer in units oF J. 009 10.0 points Suppose that the Earth (assumed spherical) has a net charge that is not zero. Without speciFying the electric potential at , is it permissible to adopt the surFace oF the Earth as a standard reFerence point oF potential and assign the electric potential V = 0 to it? 1. Yes, and there is no restriction on the sign oF the charge.

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yang (jy6223) – Electric Potential – mostarshed – (338-A1) 2 2. No. If the net charge is not zero, the potential should never be assigned to 0. 3.
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## This note was uploaded on 02/27/2011 for the course PHYS 102 taught by Professor Mostarshed during the Spring '11 term at GWU.

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Electric Potential-problems - yang(jy6223 Electric...

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