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As a variable resistor's resistance can be changed, we can therefore change the current in the circuit. This will be according to Ohms Law, as a simple resistor is a Ohmic Conductor.

So if we set u...

(need a diagram showing situation). You know that the frequency emitted by the source is given by the velocity of the emitted source divided by the wavelength (f_s = v / wavelength). It is also known that...

It does no work because there its displacement from the center of its circular trajectory remains constant throughout the entirety of its motion. Therefore, by definition, the work done, i.e. distance tra...