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89 In Fig. 28-58, an electron of × × × × × x mass m, charge -e, and low (negligi ble) speed enters the region between two plates of potential difference ,x?< > V and plate separation d, initially headed directly toward the topx plate. A uniform magnetic field of Figure 28-58 Problem 89. magnitude B is normal to the plane of the figure. Find the minimum value of B such that the electron will not strike the top plate. xtx ??????? ?????
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