An electron is accelerated from rest through a potential difference...

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An electron is accelerated from rest through a potential difference \( V \). This electron experiences a force \( F \) in a uniform magnetic field. On increasing the potential difference to \( V \), the force experienced by the electron in the same magnetic field becomes \( 2 F \). Then, the ratio \( \left(V^{\prime} / V\right) \) is equal to
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