2. A charged particle moves through a constant magnetic field. The magnetic forc
ID: 1583579 • Letter: 2
Question
2. A charged particle moves through a constant magnetic field. The magnetic force on this particle: A. increases the particle's kinetic energy whatever the sign of the charge. B. increases the KE of the particle if its charge is positive and decreases the KE of the particle if its charge is negative. C. is in the direction of motion of the particle. D. does not influence the kinetic energy of the particle. E. is independent of the speed of the particle whatever the direction of motion. 3. An electron is moving vertically upward at 2.0 x 108 m/s in a magnetic field of 1.0 T directed toward the east. The magnetic force on the electron is: A. 2.0 × 108 N north D. 2.0 x 108 N south G. 3.2x 10-11 N vertically up B. 2.0 x 108 N east E. 3.2 × 10-11 N north H. 3.2 × 10-11 N south C. 2.0 × 108 N vertically up F. 3.2 × 10-11 N to the west 4. A proton (positively charged hydrogen nucleus) has an initial north-directed velocity, but is observed to curve toward the east as a result of a magnetic field B. The direction of B is: B. to the west. C. downward, into the paper. F. to the south. A. to the east. D. upward, out of the paper. E. to the northExplanation / Answer
2) D) does not influence the kinetic energy of the particle.
Because, The direction of magnetic force always perpendicular to the instantaneous velocity.
3) H) 3.2*10^-11 N south .
F = q*v*B*sin(90)
= 1.6*10^-19*2*10^8*1*1
= 3.2*10^-11 N south
4) D) upward, out of the paper.
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