Net force acting on the particle will be:
Fnet = Magnetic force(Fm) + Electric force(Fe)
now, magnetic force on a moving charge in magnetic field is given by:
Fm = q*VxB
here, q = charge = 1.5 uC = 1.5*10^-6 C
V = Velocity of particle = 3.3*10^6 m/s (+i)
B = Magnetic field = 0.0018 T (+j)
Fm = q*(V i)x(B j) = q*V*B k
Fm = (1.5*10^-6)*(3.3*10^6)*0.0018 k
Fm = 0.00891 k
Electric force on charge particle qill be:
Fe = q*E
given, E = electric field = 4.6*10^3 N/C (+j)
then, Fe = (1.5*10^-6)*(4.6*10^3) j
Fe = 0.0069 j
So, net force(Fnet) = 0.0069 j + 0.00891 k
magnitude of net force will be:
|Fnet| = sqrt(0.0069^2 + 0.00891^2)
|Fnet| = 0.011269 N
|Fnet| = 1.13*10^-2 N
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