In a mass spectrometer, a positively charged magnesium ion is accelerated from rest through a potential difference (region I). It then moves in a straight line through region II. Finally, the particle enters region Ill where there is no electric field. Region III Region Region II +q Detector What can be claimed to be true about the magnetic fields in the different regions? O B1 = 0, Bil is out of the page, Bin is out of the page O B, = 0, Bil is into the page, Bill is into the page O B, is to the right, By is to the right, Bill is downward O Bj = 0, Bui is into the page, Bill is out of the page O B, = 0, By is to the right, Bin is out of the page O Bi = 0, But is to the right, Bill is downward O B, is out of the page, By is to the right, Bill into the page B, = 0, Bil is out of the page, Bill is into the page