3.Three point charges, q 1 = 2.0 ?C, q 2 = 2.0 ?C, and q 3 = -1.0 ?C, are locate

Question

3.Three point charges, q1 = 2.0 ?C, q2 = 2.0 ?C, and q3 = -1.0 ?C, are located at the vertices of an equilateral triangle of side length 30 cm. What is the potential energy of this arrangement?

11.What is the force on a proton sitting midway between a pair of parallel conducting plates that sit at potentials of -17 V and 55 V, respectively? Their separation distance is 1.5 cm.

3.Three point charges, q1 = 2.0 ?C, q2 = 2.0 ?C, and q3 = -1.0 ?C, are located at the vertices of an equilateral triangle of side length 30 cm. What is the potential energy of this arrangement?

11.What is the force on a proton sitting midway between a pair of parallel conducting plates that sit at potentials of -17 V and 55 V, respectively? Their separation distance is 1.5 cm.

Explanation / Answer

potential energy of system , U= K/r (q1q2 +q2q3 +q1q3) =>U = K/r (-2-2+4) =0 Now, potential difference = electric field *separation between plates => 55- (-17)= E * 0.015 => E = 4800 N/C Force on proton = 1.602

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