PHY-252 Spring 2018 HOMEWORK (use separate paper) 1. Two circular disks spaced 0

Question

PHY-252 Spring 2018 HOMEWORK (use separate paper) 1. Two circular disks spaced 0.50 mm apart form a parallel-plate capacitor. Transferring 3.0x10 electrons from one disk to the other causes the electric field strength to be 2.0x1o'NIC. the diameters of the disks? Show your work. What are 2. The surface charge density on an infinite charged plane is -2.0x10 CIm. A proton is shot straight away from the plane at 2.0× 10,m/s . How far does the proton travel before reaching its turning point? Show your work. long chareed wire is (2000 N/C, toward the wire). What is the

Explanation / Answer

Voltage = E*d = 2*10^5 * 0.5*10^-3 = 100 V

Q = 3*10^8*1.6*10^-19 = 48*10^-12 C = 48 pC

C = Q/V = 48 /100 = 0.48 pF = 0.48*10^-12 F

C = Aeo / d

0.48*10^-12 = pi*r^2 * 8.85*10^-12 / 0.5*10^-3

r = 0.003 m

d = 2r = 2*0.003= 0.006 m = 6 mm

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