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nuclear_dog
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Homework Statement
A particle of mass m and charge q moves in a region with a magnetic field B(r) which is time independent. What is [itex]\frac{dA}{dt}[/itex] as seen by the particle.
Homework Equations
The Attempt at a Solution
Since the B field is not varying with time, I know that the change in A will be due to the change in position of particle with time. It should be (∂A/∂x)vx + (∂A/∂y)vy + (∂A/∂z)vz . So can it be (v.∇)A. But I cannot seem to be able to go furthur.