Exam 2 Study Guide

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Exam 2 Study Guide

Study Guide
The University of Vermont
Phys 012 - Elementary Physics
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Exam # 2 Study Guide Lectures: 11 - 20 Lecture 11 (February 9) Magnetic Forces and Fields Problem: If a particle of charge -1.6 x 10-19 C is moving at 8 x 106 m/s at 30 degrees relative to a 0.5 T magnetic force field, what is the net force on the particle? Answer: FB = qvBsinθ = (-1.6 x 10-19 C)( 8 x 106 m/s)sin(30) = 3.2 x 10-3 N Lecture 12 (February 11) Velocity Selector Problem: A particle of charge q and velocity v passes through a parallel plate capacitor containing an electric field E pointed downward. A magnetic field B is present within the capacitor perpendicular to v and E going away from the observer. Find an expression for v so the particle passes through the plates of the capacitor without curving upward or downward. Answer: ΣFy = qvBsinθ – qE = 0 qvB = qE vB = E v = E/B Lecture 13 (February 13) Ampere’s Law Problem: A wire carrying a current I contains a circular loop of radius a. Find an expression for the net magnetic field at the center of the loop. Answer: Bnet = Bwire + Bloop = [(μ0I)/2a] + [(μ0I)/2πa] Physics 012 1st Edition

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