Explanation:
The given data is as follows.
F = 
q = 
v = 385 m/s
= 0.876
Now, we will calculate the magnitude of magnetic field as follows.
B = 
= 
=
T
= 10.65 T
Thus, we can conclude that magnitude of the magnetic field is 10.65 T.
I don’t know if this is helpful, but I found this
Proton : 0.00000000000000000000000161726
Electron : 0.00000000000000000000000000091093
Take them away =
1.616349e−24
(that's what it gave me on the calculator when I did proton - electron)