The pictures below show a sequence of events. The large square loop is stationar
ID: 2035493 • Letter: T
Question
The pictures below show a sequence of events. The large square loop is stationary and has a counter-clockwise current flowing in it. A smaller wire loop is held above the stationary loop and relcased so that it falls past it under the influence of gravity. In each picture the square loop has a velocity downward 19. In picture A, the induced current in the small loop will: A) Be zero B) Flow in a clockwise direction C) Flow in a counter-clockwise direction 20. In picture B, the flux inside the small loop is: A) Into page B) Out of Page C) Zero 21. In picture C, the induced current in the small loop will: A) Be zero B) Flow in a clockwise direction C) Flow in a counter-clockwise direction 22. In picture D, the acceleration of the loop is: A) Equal to g the acceleration of gravity B) Greater than g the acceleration of gravity C) Less than g the acceleration of gravityExplanation / Answer
19. The magnetic field produced by the bigger loop is coming out of the paper, so as the smaller loop moves down, the magnetic field going out of the smaller loop increases, so to oppose it produces a magnetic field going into the paper by flowing current clockwise.
Answer: B
20.As the magnetic field due to bigger loop is outside the page, flux through the smaller loop is out of the page
Answer: B
21. As the loop is moving closer to the bottom wire the magnetic field coming out of page through small loop increases so to oppose it produces a magnetic field going into the paper by flowing current clockwise.
Answer: B
22. As the smaller loop moves the magnetic field coming out of the page reduces. so to oppose it small loop produces a magnetic field going out of paper by flowing current counterclockwise.
The magnetic field at the top arm of the smaller loop is out of the page and current is left (counterclockwise) so it experiences a force upwards
The bottom arm of the smaller loop is in the magnetic field going inside the page and current in the arm is to the right so it experiences a force in the upward direction. So there is a net upward force acting on the smaller loop. So the downward force weight will be reduced by this force so acceleration will be less than g.
Answer: C
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