MCQ: An hypothetical electrostatic voltmeter with spring control is designed with one fixed and another movable plate. Both plates are in the form of a circle with one plate over the other so as to produce a rotatary motion. If a voltage is applied between them, no rotatry motion is produced because :

• A. There is no change in the voltage
• B. The is no change in the capacitance irrespective of the relative position of the two plates
• C. The spring force is very large
• D. The applied voltage is small to produce any noticeable deflection.