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Unformatted text preview: Solution for Homework 14 Introduction to Magnetic Fields Solution to Homework Problem 14.1(Exploding Capacitor Velocity) Problem: In the book, Electronic Gadgets for the Evil Genius , they describe an electronic pulser that uses capacitors with energy storage of 5000 . 0J . If something went wrong, and all this energy got converted into kinetic energy of a small piece of metal (say of the mass of a 45 caliber bullet m = 0 . 0149kg ), how fast would the piece of metal be going? Note this is strickly a kinetics problem, no electricity and magnetism required. Second note, be very careful with high voltage systems. For your reference, the muzzle velocity of a rifle is about 350 m s . Select One of the Following: (a) 336 , 000 m s (b) 580 . m s (c) 1 . 20 m s (d) 12 . 4 m s (e-Answer) 819 m s Solution Just conseve energy U = 1 2 mv 2 , or v = radicalbigg 2 U m = radicalBigg 2(5000J . 0149kg = 819 m s Total Points for Problem: 3 Points Solution to Homework Problem 14.2(Maximum Field of House Wiring) Problem: Modern house wiring is fused at 20A . What is the magnetic field from the maximum house current at 1mm from an isolated wire (modeled as an infinite staraight wire), the closest you can get for an insulated wire?...
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