At the Fermilab Accelerator in Weston,Illinois,singly-Charged Ions with Momentum 3

Multiple Choice

At the Fermilab accelerator in Weston,Illinois,singly-charged ions with momentum 3.3 × 10−¹⁶ kg⋅m/s are held in a circular orbit of radius 1.00 km by an upward magnetic field.What B field must be used to maintain the ions in this orbit? (qion = 1.60 × 10−¹⁹ C)

A) 5.3 T
B) 2.1 T.
C) 2.1 T
D) 0.19 T
E) 0.48 T