A doubly charged helium atom whose mass is 66 10-27 kg is, Ask an Expert

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A doubly charged helium atom whose mass is 6.6 10-27 kg is accelerated by a voltage of 2500 V. The atom enters a region of uniform magnetic field perpendicular to its velocity.

(a) What is the magnitude of the magnetic field if the atom's trajectory forms a 4.1 cm radius circle?

(b) What is its period of revolution?

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