21. In x ray machines, electrons are subjected to electric fields as great as 4.

Question

21. In x ray machines, electrons are subjected to electric fields as great as 4.0 x 10* N/C. Find an electron's acceleration in this field. (me 9.11 x 10-1 kg, e 1.6 x 10-19O) A. 1.1 x 1017 m/s2 B. 7.0 x 1016 m/s2 C. 3.6x 10 m/2 D. 4.6 x 1010 m/s2 22. Electrons in a particle beam each have a kinetic energy of 3.2x iO-17 J. what is the magnitude of the electric field that will stop these electrons in a distance of 0.05 m? (hint: remember the definition of eV, may help you do it faster.) A. 2000 N/C B, 200 N/C C. 4000 N/C D. 1000 N/C 23. An electron moves on a path perpendicular to the direction of a uniform electric field of strength 3.0 N/C. How much work is done on the electron as it moves 20 cm? A. 1.6 x 10-20j B. 4.8 x 10-20 C. -4.8 x 10-20 D. 0? 24. A solid conducting sphere of 10 cm radius has a net charge of 40 x 10-9C. If the potential at infinity is taken as zero, what is the potential at the center of the sphere? A. 360V B. 3.6 x 103V C. >3.6 x 104V D. 36?? MacBook Pro

Explanation / Answer

21) acceleration = F/m

= qE / m

= 1.6*10^-19*4*10^5 / 9.11*10^-31

= 7*10^16 m/s2

so option B) is the correct answer

22) KE = F*d

3.2*10^-17 = 1.6*10^-19*E*0.05

E = 4000 N/C

so option C) 4000 N/C is the correct answer

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