Explanation:
(a). Since the charge enters the magnetic field and was deflected it carries a +ve charge
(b). The magnetic force on the particle is given as
F = Bqv
Where B = magnetic field in Tesla T
1.25-T
q= charge 8.50 mC
v = average velocity of charge
4.75 km/s converting to
m/s we have 4.75*1000= 4750m/s
Substituting our given corresponding data we have
F= 1.25*8.50*10^-3*4750
F= 50.47N
The magnetic force on the particle is 50.47N