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प्रश्न
A charge ‘q’ moving along the X- axis with a velocity `vecv` is subjected to a uniform magnetic field B along the Z-axis as it crosses the origin O.
(i) Trace its trajectory.
(ii) Does the charge gain kinetic energy as it enters the magnetic field? Justify your answer.
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उत्तर
(i)
The direction of magnetic field is along the negative X-direction. Hence, the magnetic force will act in such a way that this particle describes a circular motion as shown below.
(ii) No, the charge does not gain kinetic energy because the force and velocity are perpendicular to each other.
`W = vecF.vecv =Fvcostheta`
`theta = 90°`
Thus, force does not bring out any change in the velocity.
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