A velocity selector; (a region of perpendicular electric and magnet...

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A velocity selector; (a region of perpendicular electric and magnetic field)
I. allows charged particles to pass straight when \( v=E / B \).
II. deflects particles in the direction of electric field when \( vE / B \).
III. deflects particles in a direction perpendicular to both \( \mathrm{v} \) and \( \mathrm{B} \), when \( vE / B \).
IV. deflects all particles in a direction perpendicular to both \( E \) and \( B \).
Which of the above statements are correct?
(a) I, III and IV
(b) II, III and IV
(c) I, II and III
(d) I, II and IV
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