(a) Classify the following errors into either Random / Systematic / Human error: (i) Construction error (ii) Interference due to electric field (b) A voltage waveform is displayed on a CRO as shown in Figure-A1 with vertical sensitivity at 2 V/div and time base set at 250ms/div. 2V/div+250 ms. OV Figure-A1 (1 mark) (1 mark) (i) Determine the frequency of the waveform (ii) Determine the trigger slope (positive or negative) and trigger voltage (1 mark) (2 marks)