Answer:
0.23348 A
Step-by-step explanation:
B = Magnetic field
v = Velocity of electron =

q = Charge of electron =

= Vacuum permeability =

r = Radius of circle = 0.026 m
N = Number of turns = 103 turns/cm =

I = Current
The magnetic and centripetal force will be balanced

The magnetic field in solenoid is given by

From the first equation

The current in the solenoid is 0.23348 A