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An electron moving towards east is acted up on by a magnetic field in the north direction.The force on the electron is a) vertically upwards b) vertically downwards c) towards north d) towards east

An electron moving towards east is acted up on by a magnetic field in the north direction.The force on the electron is a) vertically upwards b) vertically downwards c) towards north d) towards east

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An electron moving towards east is acted up on by a magnetic field in the north direction.The force on the electron is a) vertically upwards [ ] b) vertically downwards c) towards north d) towards east 12 A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5T. The force on the proton is a) 2.5 x 10-10N b) 8 x 10-1'N c) 2.5 x 10-1 N d) 8 x 10-12 N [ 13. A proton injected into a magnetic field and moving perpendicular to the lines of force takes up a) straight path b) parabolic path c) circular path d) helical path [ ] 14. If an electron and a proton are projected at right angles to uniform magnetic field with the same linear momentum [ ] a) The electron trajectory will be less curved than the proton trajectory b) The proton trajectory will be less curved than the electron trajectory c) both trajectories will be equally curved d) both particles will move in stright lines 15. A charged particle enters at 30° to the magnetic field it path becomes a) circular [ b) helical c) parabolic d) straight line 16. Among the following particles, which will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field [ ] a) electron b) Proton c) Het d) Li* 17. A proton and an alpha particle enter in a uniform magnetic field with the same velocity. The period of rotation of alpha particle will be a) four times that of proton c) three times that of proton [ ] b) two times that of proton d) same as that of proton 18. Assertion (A) : The energy of a charged particle moving in a uniform magnetic field does not change Reason (R) : Work done by the magnetic field on charge is zero a) Both A' and R are correct and 'R' is the correct explanation of 'A’ b) Both 'A' and R' are correct but R is not the correct explanation of A c) 'A' is correct, R is incorrect [ ] d) 'A' is incorrect, R is correct 19. A 10g bullet having a charge of 4.00mC is fired at a speed of 270 m/s in a horizontal direction. A vertica magnetic field of 500mT exists in the space. The deflection of the bullet due to the magnetic field as i travels through 100 m is (Make appropriated approximations) a) 3.7 x 10° m b) 3.7 x 106m c) 6.2 x 10-m d) None 20. A proton, a deuteron and an alpha particle moving with equal K.E enter perpendicular into a magneti field. If r,r, and r are the respective radii of the circular paths, then the ratios r_/r and r/r are p' P a 1 1 a) 1, V2 b) 1,- c) 1 d) 21. Singly charged magnesium (A = 24) ions are accelerated to kinetic energy 2keV and are projecte perpendicularly into a magnetic field B of magnitude 0.6 T. (a) The radius of the circle formed by tL ions and (b) If there are also singly charged ions of the isotope magnesium - 26, the radius for the particles are a) 5.3 cm, 5.5 cm b) 4.5 cm, 3.5 cm c) 2 cm, 2.5 cm d) 3.3 cm, 4.5 cm
Transcribed Image Text:An electron moving towards east is acted up on by a magnetic field in the north direction.The force on the electron is a) vertically upwards [ ] b) vertically downwards c) towards north d) towards east 12 A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5T. The force on the proton is a) 2.5 x 10-10N b) 8 x 10-1'N c) 2.5 x 10-1 N d) 8 x 10-12 N [ 13. A proton injected into a magnetic field and moving perpendicular to the lines of force takes up a) straight path b) parabolic path c) circular path d) helical path [ ] 14. If an electron and a proton are projected at right angles to uniform magnetic field with the same linear momentum [ ] a) The electron trajectory will be less curved than the proton trajectory b) The proton trajectory will be less curved than the electron trajectory c) both trajectories will be equally curved d) both particles will move in stright lines 15. A charged particle enters at 30° to the magnetic field it path becomes a) circular [ b) helical c) parabolic d) straight line 16. Among the following particles, which will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field [ ] a) electron b) Proton c) Het d) Li* 17. A proton and an alpha particle enter in a uniform magnetic field with the same velocity. The period of rotation of alpha particle will be a) four times that of proton c) three times that of proton [ ] b) two times that of proton d) same as that of proton 18. Assertion (A) : The energy of a charged particle moving in a uniform magnetic field does not change Reason (R) : Work done by the magnetic field on charge is zero a) Both A' and R are correct and 'R' is the correct explanation of 'A’ b) Both 'A' and R' are correct but R is not the correct explanation of A c) 'A' is correct, R is incorrect [ ] d) 'A' is incorrect, R is correct 19. A 10g bullet having a charge of 4.00mC is fired at a speed of 270 m/s in a horizontal direction. A vertica magnetic field of 500mT exists in the space. The deflection of the bullet due to the magnetic field as i travels through 100 m is (Make appropriated approximations) a) 3.7 x 10° m b) 3.7 x 106m c) 6.2 x 10-m d) None 20. A proton, a deuteron and an alpha particle moving with equal K.E enter perpendicular into a magneti field. If r,r, and r are the respective radii of the circular paths, then the ratios r_/r and r/r are p' P a 1 1 a) 1, V2 b) 1,- c) 1 d) 21. Singly charged magnesium (A = 24) ions are accelerated to kinetic energy 2keV and are projecte perpendicularly into a magnetic field B of magnitude 0.6 T. (a) The radius of the circle formed by tL ions and (b) If there are also singly charged ions of the isotope magnesium - 26, the radius for the particles are a) 5.3 cm, 5.5 cm b) 4.5 cm, 3.5 cm c) 2 cm, 2.5 cm d) 3.3 cm, 4.5 cm
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