TAILIEUCHUNG - physics_test_bank_split_28

Tham khảo tài liệu 'physics_test_bank_split_28', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http 5. The magnetic force on a charged particle is in the direction of its velocity if A. it is moving in the direction of the field B. it is moving opposite to the direction of the field C. it is moving perpendicular to the field D. it is moving in some other direction E. never ans E 6. A magnetic field exerts a force on a charged particle A. always B. never C. if the particle is moving across the field lines D. if the particle is moving along the field lines E. if the particle is at rest ans C 7. The direction of the magnetic field in a certain region of space is determined by firing a test charge into the region with its velocity in various directions in different trials. The field direction is A. one of the directions of the velocity when the magnetic force is zero B. the direction of the velocity when the magnetic force is a maximum C. the direction of the magnetic force D. perpendicular to the velocity when the magnetic force is zero E. none of the above ans A 8. An electron is moving north in a region where the magnetic field is south. The magnetic force exerted on the electron is A. zero B. up C. down D. east E. west ans A 9. A magnetic field CANNOT A. exert a force on a charged particle B. change the velocity of a charged particle C. change the momentum of a charged particle D. change the kinetic energy of a charged particle E. change the trajectory of a charged particle ans D 406 Chapter 28 MAGNETIC FIELDS Simpo PDF Merge and Split Unregistered Version - http 10. A proton charge e traveling perpendicular to a magnetic field experiences the same force as an alpha particle charge 2e which is also traveling perpendicular to the same field. The ratio of their speeds Vproton vaipha is A. B. 1 C. 2 D. 4 E. 8 ans C 11. A hydrogen atom that has lost its electron is moving east in a region where the magnetic field is directed from south to north. It will be deflected A. up B. .

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