A negatively charged particle moves in the plane of the page through two regions

Question

A negatively charged particle moves in the plane of the page through two regions with uniform magnetic field, as shown in the figure. The S-shaped curve shows the path of the particle. What are the directions of the magnetic field in the two regions? The picture is here: http://imgur.com/9krFSaB Select the best answer: A)Both fields point out of the page. B)Ba is into the page, Bb is out of the page. C)Both fields point into the page. D)Ba is out of the page, Bb is into the pag NOTE: "Ba is out of the page, Bb is into the page." was what I guessed, but this is NOT the correct answer. So the correct answer is one of the other three choices.

Explanation / Answer

applying FLeming RH rule

Direction of magnetic field is given here by

Ba is into the page, Bb is out of the page.

here it is Option [B]

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