1 1 point How much current flows through the central resistor marked "A" when the other resistors (marked "R") all have the same resistance? The voltage is held at V2 at the top and at V1 at the bottom. The answer gives a clue as to one of the practical applications of bridge circuits. R R R none of the above O (V2 - V1) /(A + R) O (V2 - V1) / (A + R/2) O (V2 - VI) /A O (V2 - V1) / (A + 2R) O zero