What happens to the current through r3 when the switch is moved to the open position b? r1 = r2 = r3. neglect the internal resistance of the battery. 1. the current through r3 decreases to twothirds its original value. 2. the current through r3 remains the same. 3. the current through r3 increases to three-halves its original value. 4. the current through r3 is reduced to one-half its original value. 5. the current through r3 increases to twice its original value?