[填空题]
The current through thvg . dgmi97+x-jbn,g cevc8) h00ai5 ycozw0rn $4.0-k\Omega$ resistor in (Fig. Below) is 3.50 mA. What is the terminal voltage $V_{ba}$ of the “unknown” battery? (There are two answers. Why?) [Hint: use conservation of energy or Kirchhoff’s rules.]
right $V_{ab}$ V
left $V_{ab}$ V
