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Electric potential


Two large, parallel conducting plates are d=10 cm d = 10 \text{ cm} apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electric field of strength E=4.00×104 N/C E = 4.00 \times 10^4 \text{ N/C} acts on an electron placed anywhere between the two plates. (Neglect fringing.) What is the potential difference between the plates?

A uniform electric field of 200 N/C 200 \text{ N/C} points to the left as shown in above figure. When the distance between points A A and B B is d=5 cm, d= 5 \text{ cm}, what is the difference in potential VAVB V_A - V_B between points A A and B? B?

A charge of 6.0 nC, 6.0 \text{ nC}, is initially at a point that is r1=3.0 m, r_1 = 3.0 \text{ m}, away from a charge of 1.0 nC 1.0 \text{ nC} moves further away to a point where the distance is r2=7.0 m.r_2= 7.0 \text{ m}. What is the approximate potential difference between the two points.

Assume that electric constant is ϵ0=8.9×1012 F/m. \epsilon_0 = 8.9 \times 10^{-12} \text{ F/m}.

A 9-V battery has an electric potential difference of 9 V9\text{ V} between the positive and negative terminals. How much kinetic energy in J would an electron gain if it moved from the negative terminal to the positive one?

Details and Assumptions:

  • The charge on the electron is 1.6×1019 C-1.6 \times 10^{-19}~\mbox{C}.
  • You may assume energy is conserved (so no drag or energy loss due to resistance for the electron).

As shown in the above figure, three point charges q1=2.0 nC,q2=5.0 nC q_1 = 2.0 \text{ nC}, q_2 = 5.0 \text{ nC} and q3=4.0 nC q_3 = 4.0 \text{ nC} are placed at the three corners of a square with side length d=7 m. d = 7 \text{ m}. Find the approximate potential at the point A. A.

Assume that electric constant is ϵ0=8.9×1012 F/m \epsilon_0 = 8.9 \times 10^{-12} \text{ F/m} and 2 \sqrt{2} is 1.4. 1.4.


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