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Moving Charges And Magnetism
Question
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Define the SI unit of magnetic field. “A charge moving at right angles to a uniform magnetic field does it undergo change in kinetic energy”. Why?

Answer

The strength of magnetic field at a point is called one Tesla, if a charge of 1 Coulomb when moving with a velocity of 1 metre per second along a direction perpendicular to the direction of magnetic field, experiences a force of 1 Newton.

The magnitude of velocity remains same and hence, the field does no work on the particle. Therefore there is no change in kinetic energy.

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Some More Questions From Moving Charges And Magnetism Chapter

Answer the following questions:
A charged particle enters an environment of a strong and non-uniform magnetic field varying from point to point both in magnitude and direction, and comes out of it following a complicated trajectory. Would its final speed equal the initial speed if it suffered no collisions with the environment?