Question

an electron moving along the axis of a long solenoid carrying current experiences no force how do you interpret it​

Answer 1

Let the electron (e) is projected with a uniform velocity (v) in a uniform magnetic field B. The magnitude of force on it is ∣  F ˉ ∣=−e∣  v ˉ  × ∣ = −evBsinθ

As θ = 0^0  

F = _evB sin 0^0

Hence the electron will continue to move with uniform velocity along the axis of the solenoid