Why LVDT have secondary windings connected in differential 1. Higher out put

Why LVDT have secondary windings connected in differential

1. Higher out put
2. Based on the out put voltage-/+, helps to identify the
direction of displacement
3. To establish a null/ reference point

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Why LVDT have secondary windings connected in differential 1. Higher out put 2. Based on the out..

Answer / sandeep

the answer is 2&3?. in one of the book i found choice 1..
..Please justify

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