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Hydrogen ions H+ move in helical trajectories of radius 40cm with a cyclotron frequency of 10kHz...

Hydrogen ions H+ move in helical trajectories of radius 40cm with a cyclotron frequency of 10kHz in the magnetic field of a star. Calculate:
a. The magnetic field of the star,
b. The speed of the ions,
c. The magnitude of the magnetic force,
d. The acceleration of the ions.
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