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One component of a magnetic field has a magnitude of 0.0445 T and points along the +x axis, while the other component has a magnitude of 0.0725 T and points along the y axis. A particle carrying a charge of +1.01 × 105 C is moving along the +z axis at a speed of 4.18 × 103 m/s. (a) Find the magnitude of the net magnetic force that acts on the particle. (b) Determine the angle that the net force makes with respect to the +x axis.

Physics 
Elena,
B=sqrt{B(x)²+B(y)²} = …
F=qvBsinα
sinα=sin90=1 =>
F=qvB = …