An electron (mass 9×10⁻³¹ kg and charge 1.6×10⁻¹⁹C) moving with speed c/100 (c = speed of light) is injected into a magnetic field B of magnitude 9×10⁻⁴ T perpendicular to its direction of motion. We

Question

An electron (mass 9×10⁻³¹ kg and charge 1.6×10⁻¹⁹C) moving with speed c/100 (c = speed of light) is injected into a magnetic field B of magnitude 9×10⁻⁴ T perpendicular to its direction of motion. We wish to apply an uniform electric field E together with the magnetic field so that the electron does not deflect from its path. Then (speed of light c = 3×10⁸ ms⁻¹)

Accepted Answer

$\vec{E}$ is perpendicular to $\vec{B}$ and its magnitude is 27×10² V m⁻¹

Answer

$\vec{E}$ is perpendicular to $\vec{B}$ and its magnitude is 27×10⁴ V m⁻¹

Answer

$\vec{E}$ is parallel to $\vec{B}$ and its magnitude is 27×10² V m⁻¹

Answer

$\vec{E}$ is parallel to $\vec{B}$ and its magnitude is 27×10⁴ V m⁻¹

NEET 2025 Physics Motion of Charged Particles MCQ Question

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