Two protons \( P \) and \( Q \) move parallel to the \( x \)-axis i...

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Two protons \( P \) and \( Q \) move parallel to the \( x \)-axis in opposite directions with equal speeds \( v \). At the instant shown, the ratio of magnetic force and electric force acting on the proton \( P \) is ( \( c= \) speed of light in vacuum)
\( \mathrm{P} \)
(a) \( \frac{v}{c} \)
(b) \( \frac{v^{2}}{c^{2}} \)
(c) \( \frac{v d^{2}}{c} \)
(d) \( \frac{2 v}{c} \)
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