Exercises 6.7: AC Electric field

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6.7.1 The figure shows the velocity of a single electron in a DC magnetic field and a perpendicular oscillating electric field, with a frequency near, but not equal to , the cyclotron resonance frequency.

A) By what fractional amount (delta-omega)/(omega) is the frequency off resonance?

B) What IS the value of the magnetic field? (Two possible answers.)