Solving a problem in physics section 67 point 41 electr

41. What should be the EMF ε of the current source so that the electric field in the flat capacitor is equal to E = 2 kV / m if the internal resistance of the current source is r = 2 Ohms, the resistance of the resistor is R = 10 Ohms, the distance between the plates of the capacitor is d = 2 mm (see fig.)?