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numbers 2 and 3

Show your works and units for full credits: (2 points) 13. A small 1.00-g plastic ball that has a charge q of 1.20 C is suspended by a string that has a length L of 1.00 m in a uniform electric field, as shown in the figure. If the ball is in equilibrium when the string makes an angle of θ-10° the vertical. What is the strength of the electric field E? (2 points) 14. Four charges are at the corners of a square, with B and C on opposite corners. Charges A and D on the other two corners, have equal charge, while both B and C have a charge of +1.0 C. What is the charge q on A so that the force on B is zero? 9I h@ ⑧ic (Bonus: 1 Point) 15. Two point charges +q and +2q are placed on x-axis, as shown in the figure. One is at the origin (x = 0) and the other at x a. A third charge will be placed between those two charges. At some point where x d, the net force acting on the third charge is zero, and at this point the net electric field is also zero. Calculate the position d in terms of a. x a 29+ E=0
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Answer #1

Charge on square corner and position where electric field & electric force are zero

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