Problem 25.25 Part A Two 2.50-cm-diameter disks spaced 1.50 mm apart form a para

Question

Problem 25.25 Part A Two 2.50-cm-diameter disks spaced 1.50 mm apart form a paralel-plate capacitor. The electric field between the disks is 4.90x105 V/m What is the voltage across the capacitor? Express your answer to two significant figures and include the appropriate units. Submit My Answers Give Up Correct Part B An electron is launched from the negative plate. It strikes the positive plate at a speed of 2.20x10 m/s. What was the electron's speed as it left the negative plate? Express your answer to two significant figures and include the appropriate units. 2.3 1022 m Submit My Answers Give Up Incorrect; Try Again; 9 attempts remaining

Explanation / Answer

(B) a = q E / m

a= (1.602 x 10^-19) (4.90 x 10^5) / (9.109 x 10^-31)

a = 8.618 x 10^16 m/s^2

vf^2 - vi^2 =2 a d

(2.20 x 10^7)^2 - v0^2 = 2(8.618 x 10^16)(1.50 x 10^-3)

v0 = 1.50 x 10^7 m/s ......Ans

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