SOLUTION

• In instrument control mechanisms using two springs, the springs are indeed wound in opposite directions.
• In measuring instruments like ammeters or voltmeters, two springs (A and B) are used to ensure the needle shows an accurate reading.
• These springs are wound in opposite directions.

• When the needle rotates, one spring (let’s say A) winds up, while the other spring (B) unwinds.
• Together, these springs create a force that tries to return the needle to its original position.
• This force is known as the controlling torque.
• The torsional torque of these springs is directly proportional to the angle of rotation of the needle.
• This means the more the needle rotates, the greater the torsional force generated within the springs, and the greater the controlling torque applied