At the Fermilab Accelerator in Weston, Illinois, Singly-Charged Ions with Momentum

question 63

Multiple Choice

At the Fermilab accelerator in Weston, Illinois, singly-charged ions with momentum 3.2 *10 ^{- 16} kg.m/s are held in a circular orbit of radius 1 km by an upward magnetic field. What B-field must be used to maintain the ions in this orbit? (q_ion = 1.6 *10 ^{- 19} C)

• A) 4 T
• B) 2 T
• C) 1 T
• D) 3 T

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