AP EAMCET · PHYSICS · Magnetic Effects of Current
When an electron placed in a uniform magnetic field is accelerated from rest through a potential difference \(\mathrm{V}_1\), it experiences a force F . If the potential difference is changed to \(\mathrm{V}_2\), the force experienced by the electron in same magnetic field is 2 F , then the ratio of potential differences \(\frac{\mathrm{V}_2}{\mathrm{~V}_1}\) is
- A \(2: 1\)
- B \(1: 4\)
- C \(4: 1\)
- D \(1: 2\)
Answer & Solution
Correct Answer
(C) \(4: 1\)
Step-by-step Solution
Detailed explanation
\(\mathrm{K} \cdot \mathrm{E}=\frac{1}{2} \mathrm{mv}^2=\mathrm{eV} \Rightarrow \mathrm{v}=\sqrt{\frac{2 \mathrm{eV}}{\mathrm{m}}}\) Force on electron in magnetic field is…
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