Question 4 Three point charges are located at the corners of a equilateral triangle as shown in the figure. y-axis. Fig. 1 93 +0.50 CO 10.0 cm 10.0 cm x-axis 91 = +0.50 C 10.0 cm (a) Calculate the components of electric field at charge q due to the other two charges. (b) Calculate the magnitude of the electric force on charge q. (c) Calculate the angle for the electric field vector in xy-system. (d) Calculate the electric potential energy of the three charges. 92 +0.50 C 12 Question 5.... A sound level 20 m from a loudspeaker is 65 dB, at air temperature of 35C. The wave carries a frequency of 140 Hz. Assume the air density to be constant at p = 1.20 kg/m. 6 (a) Calculate the intensity of the sound wave 20 m from the loudspeaker. Assume that the loudspeaker is radiating the energy isotropically. (b) Calculate the pressure amplitude 20 m from the loudspeaker. (4) (3) (2) (3) (3) (3)