Physics 215 Physics 215 Journal - Spring 2018 17. Which of the following stateme
ID: 2268939 • Letter: P
Question
Physics 215 Physics 215 Journal - Spring 2018 17. Which of the following statements is correct about the magnetic field lines of a bar magnet? a) The magnetic field lines begin at the north pole and terminate on the south pole. b) The magnetic field lines begin at the south pole and terminate on the north pole. c) The magnetic field lines are closed loops, which continue through the interior of the magnet. d) The field lines created by the north pole start at the pole and extend to infinity. The field lines created by the south pole start at infinity and end on the south pole. 18. A uniform magnetic field points out of this page. A proton and an electron enter the region initially travelling from the bottom of the page to the top of the page with the same velocity a) The proton initially accelerates left, the electron right. The electron will have a higher final speed due to the acceleration. b) The proton initially accelerates lef, the electron right. The electron will have the same final c) d) speed. The proton initially accelerates right,the electron left. The electron will have a higher final speed due to the acceleration. The proton initially accelerates right, the electron left. The electron will have the same final speed. 19. T/F? If current is increasing in a single loop of wire, there is no self-inductance because a loop cannot create inductance within itself. 20. Three identical conducting loops, carrying current I, are placed at different locations inside identical uniform magnetic fields. Rank the net force on the loops. (Neglect gravity.) a) A>B>C b) C>B>A c) B-C>A d) A-B-CExplanation / Answer
17. a and c are correct
18. d is correct because lorentz force acting on the both of them will have same magnitude but opposite in direction.
19. False. Because when current increases, magnetic flux linked to the coil increases and thus coil have non zero inductance.
20. option b is correct In loop C it will have maximum force acting on it and in loop A it will be zero.