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A proton moving with velocity \( v \) is acted upon by electric field \( \vec{E} \) and magnetic field \( \vec{B} \). The proton will move undeflected with constant speed if
(1) \( E \) is perpendicular to \( B \)
(2) \( E \) is parallel to \( v \) and perpendicular to \( B \)
(3) E, B and \( v \) are mutually perpendicular and
\[
v=\frac{E}{B}
\]
(4) \( E \) and \( B \) both parallel to \( v \)
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