A small sphere with a not charge of 10 UC is placed at one comer of a square of side 5 m. What is the magnitude of the electric field at the opposite corner of the square? O 180ON/C O 900 N/C O 450 N/C O 360ON/C An open pipe produces a third harmonic standing wave of frequency 1020 Hz. Determine the length of the pipe (assume the speed of sound is 340 m/ s). If the pipe is then closed at one end, determine the frequency of the second overtone. O 0.80 m, 888 Hz O 0.51 m. 888 Hz O 0.50m, 850Hz O 0.80 m. 570 Hz