Answer:
F = 0 N
Step-by-step explanation:
Force on a moving charge in constant magnetic field is given by the formula

so here it depends on the speed of charge, magnetic field and the angle between velocity of charge and the magnetic field
here when charge is moving with speed 100 m/s in a given magnetic field then the force on the charge is given as

now when charge is moving parallel to the magnetic field with different speed then in that case

so here we have
F = 0