In Fig. 28-40, an electron with an initial kinetic energy of 4.0 keV enters region 1 at

Chapter 28, Problem 30

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In Fig. 28-40, an electron with an initial kinetic energy of 4.0 keV enters region 1 at time t 0. That region contains a uniform magnetic field directed into the page, with magnitude 0.010 T.The electron goes through a half-circle and then exits region 1, headed toward region 2 across a gap of 25.0 cm. There is an electric potential difference V 2000 V across the gap, with a polarity such that the electrons speed increases uniformly as it traverses the gap. Region 2 contains a uniform magnetic field directed out of the page, with magnitude 0.020 T.The electron goes through a halfcircle and then leaves region 2. At what time t does it leave? B1B2Region 1Region 2 Figure 28-40 30.