Ideally, the damping torque should be

(1) Proportional to velocity of the moving system and operating current.

(2) Proportional to the velocity of the moving system but independent of operating current.

(3) Independent of the velocity of the moving system and proportional to the operating current.

(4) Independent of the velocity of the moving system and operating current.

(1) Proportional to velocity of the moving system and operating current.

(2) Proportional to the velocity of the moving system but independent of operating current.

(3) Independent of the velocity of the moving system and proportional to the operating current.

(4) Independent of the velocity of the moving system and operating current.