Question

A scanning electron microscope uses a uniform 15.0-kN/C electric field to accelerate electrons horizontally toward the subject to be imaged. After travelling 5.0 cmthe electrons are accelerated to a speed of 1.62x107m/s. The next step is to deflect the electrons so that they can scan across the sample—hence the scanning electron microscope. To accomplish this, the electrons are directed between a pair of oppositely charged parallel plates, which produce a uniform electric field of 6.42x103N/C perpendicular to the electron beam. This field extends for 3.5 cm along the electron’s path.

Part B What would be the electron’s vertical displacement if the scanning electric field were reduced to 3.49×103 N/C ? Express your answer to two significant figures and include the appropriate units.

Answer 1