A Doubly Charged Ion with Speed 6

question 91

Multiple Choice

A doubly charged ion with speed 6.9 × 10⁶ m/s enters a uniform 0.80-T magnetic field,traveling perpendicular to the field.Once in the field,it moves in a circular arc of radius 30 cm.What is the mass of this ion? (e = 1.60 × 10^-19C) .

• A)11 × 10^-27 kg
• B)6.7 × 10^-27 kg
• C)3.3 × 10^-27 kg
• D)8.2 × 10^-27 kg

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