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A charged particle (mass m, charge +q) is moving in a region of uniform magnetic field B0 ˆk. If at time t = 0 the particle is at the origin and has a velocity ~u = ux ˆi + uz ˆk, what is the position vector ~r of the particle at a later time 9πm qB0 ? A. ~r = 2mux qB0 ˆj + 9πmuz qB0 ˆk B. ~r = − 2mux qB0 ˆj + 9πmuz qB0 ˆk C. ~r = 9πmuz qB0 ˆk D. ~r = 2m √ u 2 x+u 2 z qB0 ˆj

A charged particle (mass m, charge +q) is moving in a region of uniform magnetic field B0 ˆk. If at time t = 0 the particle is at the origin and has a velocity ~u = ux ˆi + uz ˆk, what is the position vector ~r of the particle at a later time 9πm qB0 ? A. ~r = 2mux qB0 ˆj + 9πmuz qB0 ˆk
 B. ~r = − 2mux qB0 ˆj + 9πmuz qB0 ˆk
 C. ~r = 9πmuz qB0 ˆk
 D. ~r = 2m √ u 2 x+u 2 z qB0 ˆj

Grade:12th pass

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