spring
gravity
eddy currents
all of the above
Answer is Wrong!
Answer is Right!
The correct answer is: A. spring.
A spring is a mechanical device that stores energy when it is compressed or stretched. When the spring is released, it converts this stored energy into kinetic energy, which can be used to power a variety of devices. In a portable instrument, the spring is often used to provide the controlling torque. This torque is what keeps the instrument from moving around
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