Answer :
At the instant it is thrown, the ball is known to be moving perpendicular to the b-field and is moving at velocity v and time taken is 1.259*10^-3 sec
F=Q(V*B)
V=velocity vector
B=magnetic field vector
q=charge
F=q(Vi*b-k)
=q|v||b|j
|Fb|=q|V|B|
t=D/v
t=2518/20000sec=1.259*10^-3sec
During the time t, the deflection of charge is negtive y direction
y=Vt+1/2at²
y=1/2ayt²
a=acceleration is -ve y direction
=Fb/m
m=mass of charge
Fb=magnetic force
ay=q|V||B|/m
q=-158.85 mc
ay=1.24*10⁵m/s
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