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A charge 'q' moving along the X-axis with a velociyt vecv (fig) is subjected to a uniform magnetic field vecB acting 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. |
Answer» SOLUTION :The trajectory is a circualr path in X - Y plane as shown in fig.  (ii) The charge does not gain kinetic energy as it enters as it enters the magnetic field `vecB`. Force `VECF ( = q vecv XX vecB)` due to magnetic field is in a perpendicular DIRECTION and changes only the direction of motion of charge. There is no change in magnitude of velocity of charge and HENCE no change in its kinetic energy. |
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