Question

force experienced by a charged particle when passes parallel to direction of magnetic field

Answer 1

when charge particle passes through a magnetic field with velocity $\blue{v}$

Then force on the charge is given by -

◆◆q v × B◆◆

q-›charge particle
v-›velocity vector
B-›magnetic field direction.

So, when charge passing parallel then it's velocity vector also parallel to magnetic field.

Means angle between velocity vector(v) and magnetic field(B) is 0°.
so,
$qvB \sin( \alpha ) \\ provided \: \alpha = 0 \\ so \\ force \: will \: be \: zero$

$\red{\boxed{Force\:is \: Zero}}$