A dry cell, a switch, an ammeter and two resistors Ri and R, are connected in series. An oscilloscope and a voltmeter are connected respectively between the terminals of R. and R 2 as shown in the figure. We close the switch K; the voltmeter displays 3.5V and the luminous line visible on the screen is displaced by two divisions. The intensity of the current in the circuit is 250mA. The vertical sensitivity of the oscilloscope is 1V / d * i * v . 1. Is the terminal COM of the voltmeter connected to Cor B? Justify. ( i P (s) 2. Determine the value of R 2 .(1pt) K R 1 3. What voltage is measured with the oscilloscope U AB Or U RA ? In which way does the luminous line move? (1.25pts) Determine the voltage between A and B. Deduce the value of R 1 . (2pts) 5. Determine the voltage delivered by the dry cell. (1.5pts) 4. R2 777