In the figure a part of circuit is shown: (A) current will flow from \( A \) to \( B \) (B) curr...

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In the figure a part of circuit is shown:
(A) current will flow from \( A \) to \( B \)
(B) current may flow from \( A \) to \( B \)
(C) current will flow from \( B \) to \( A \)
(D) the direction of current will depend on \( r \).
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