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3. Two equal positively charged particles are at opposite corners of a trapezoid as shown in the figure below. 45.0 45.0 2d te (a) Find a symbolic expression for the total electric field at the point P keQ ke Q (b) Find a symbolic expression for the total electric field at the point P keQ 4. Three charged partices are at the cormers of an equlateral triangle as shown in the figure below. (Let q = 4.00 με, and L = 0.550 m.) y 7.00 AC 60.0° 4.00 AC (a) Calculate the electric field at the position of charge q due to the 7.00-HC and -4.00-C charges. (b) Use your answer to part (a) to determine the force on charge q. 59.4[mN + |-721| mtj
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