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Sir please tell me the concept of above question in the attachment

Sir please tell me the concept of above question in the attachment

Question Image
Grade:12

1 Answers

Eshan
askIITians Faculty 2095 Points
3 years ago
Dear student,

Lorentz force acting on a particle is proportional to the velocity of the body.

Now the gain in kinetic energy due to moving through potential difference is
\dfrac{1}{2}mv^2=qV
\implies v\propto\sqrt{V}
Hence the force becomes\sqrt{5}F

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