Physics

Problem

A region contains perpendicular uniform fields

E=1.6\times10^{4}\,\text{V}\,\text{m}^{-1}

and

B=0.20\,\text{T}

. Four particles enter the region with identical directions (perpendicular to both fields) but different speeds as listed below. (I) Proton, speed

4.0\times10^{4}\,\text{m}\,\text{s}^{-1}

(II) Alpha-particle, speed

6.0\times10^{4}\,\text{m}\,\text{s}^{-1}

(III) Electron, speed

8.0\times10^{4}\,\text{m}\,\text{s}^{-1}

(IV) Proton, speed

1.2\times10^{5}\,\text{m}\,\text{s}^{-1}

Which one of these particles will emerge from the region without any deflection? a) Only particle (II) b) Only particle (III) c) None of the particles d) Only particle (I)

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