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Physics Fundamentals 3 Problem set 2 (Include a Free-Body Diagram FBD if applicable) 21.19 .. Two point charges are located on the y-axis as follows: charge q1 = -1.50 nC at y = -0.600 m, and charge 92 = +3.20 nC at the origin (y = 0). What is the total force (magni- tude and direction) exerted by these two charges on a third charge 93 = +5.00 nC located at y = -0.400 m? 21.23 . CP A proton is placed in a uniform electric field of 2.75 X 105 N/C. Calculate (a) the magnitude of the electric force felt by the proton; (b) the proton's acceleration; (c) the proton's speed after 1.00 us in the field, assuming it starts from rest. 21.27 .. (a) What must the charge (sign and magnitude) of a 1.45-g particle be for it to remain stationary when placed in a downward-directed electric field of magnitude 650 N/C? (b) What is the magnitude of an electric field in which the electric force on a proton is equal in magnitude to its weight? 21.41 . Three negative point charges lie along a line as shown in Fig. E21.41. -5.00 MC Find the magnitude and direction of the electric field this combination of charges 8.00 cm - 6.00 cm produces at point P, which lies 6.00 cm from the -2.00-uC charge measured perpendicular to the line connecting the -2.00 MC three charges. 8.00 cm! 21.42 .. A point charge is placed at each corner of a square with side length a. -5.00 MC All charges have magnitude q. Two of the charges are positive and two are negative (Fig. E21.42). What is the direction of the net electric field at the center of the square due to the four charges, and what is its magnitude in terms of q and a? Figure E21.42 +q a +