Quiz #2: Topic 2 (Experiments) February 13, 2008 Name: _Solutions Problem 1 Electrons are accelerated across a potential of 12 V and enter a region of uniform magnetic field B = 8 Tesla perpendicular to the beam direction. Sketch the trajectory of the electrons for a B field going in the page. Find the velocity of electrons and the radius of curvature R of the electron beam in magnetic field. 22222⎟⎠⎞⎜⎝⎛===cvmcmvqVEK⇒22mcqVcv=and qBmvR=, where q– charge, c= 3×108m/s 862621 12243 10/2.06 10/0.511 10eVeVvcmsmsmceV××==×=××()()3166199.1 102.06 10/1.46 101.461.6 108kgm sRmmCTμ−−−×=×⋅Note about the units: eis cancelled, and T=V⋅s/m2Problem 2.A solid metal ball glows so that the spectral distribution of its radiation has the maximum at 2.0 μm. The temperature is then changed so that the total power radiated by the ball is 3 times higher than its
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