A particle having a mass of \( 0.5 \mathrm{~g} \) carries a charge of \( 2.5 \times 10^{-8} \mat...

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A particle having a mass of \( 0.5 \mathrm{~g} \) carries a charge of \( 2.5 \times 10^{-8} \mathrm{C} \). The particle is given an initial horizontal velocity of \( 6 \times 10^{4} \mathrm{~ms}^{-1} \). To keep the particle moving in a horizontal direction
(1) the magnetic field may be perpendicular to the direction of the velocity
(2) the magnetic field should be along the direction of the velocity
(3) magnetic field should have a minimum value of \( 3.27 \mathrm{~T} \)
(4) no magnetic field is required
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