3. An oscilloscope is set at 0.5 V/div on the vertical scale and 1s / div on the horizontal one. a. Sketch the trace that would be seen if a 1.5 V DC signal was connected to the y-input. b. Sketch the trace that would be seen if a square wave signal of frequency 1 Hz and amplitude 0.5 V (positive and negative) is connected to the input.