Version BB 3. An electron is released from rest in between two oppositely charge

Question

Version BB 3. An electron is released from rest in between two oppositely charged parallel conducting plates. I t takes the electron 1-10 s to travel a distance of 1.7 cm, what is the surface charge density of ea plate? A. 3.14-1019 C/m2 B. 3.42-1013 C/m2 C. 3.42.10 C/m D. 1.71-101 C/m2 E 8.57-1013 C/m2 4. An infinitely long uniform line of charge has charge per unit length +4.8 C/m and lies along the x-a A second infinitely long uniform line of charge has charge per unit length-24 C/m and is parallel to t x-axis at y-0.4 m. What is the magnitude of the net electric field at y 0.2 m? A. 6.47-10 N/C B. 4.83-10% N/C

Explanation / Answer

3] s = 0.5at^2

a = 2s/t^2 = 2*0.017/1e-6^2

= 3.4e10 m/s^2

E = ma/q

and charge density sigma = 2e0*E = 2e0* ma/q

= 2*8.85e-12*9.1e-31*3.4e10/1.6e-19

= 3.42*10^-12 C/m^2

option c is correct

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