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The Attempt at a Solution
The correct choice is A.
I know that a potentiometer provides some of its resistance of its total resistance and the other part is not contributed.
Current flows from the + of the battery and re-enters the -ve terminal.
What I can't understand is how the current goes in the diagrams shown and how to identify which part of the resistance should be considered and which not.
I've searched in books, on the internet, ... but could not find a proper explanation. If possible please, try to explain how each circuit works, not just the correct answer.
Thanks a lot