n 18 of 25 Investigators are researching the appearance of a strange movement of
ID: 1453177 • Letter: N
Question
n 18 of 25 Investigators are researching the appearance of a strange movement of objects in what the local commun considers a haunted house. The owners of the house attribute the cause to poltergeists; others blame ove strong magnetic fields could be the cause. As a scientific investigator of paranormal claims, you decide to investigate. You will start by focusing on magnetic fields. Using a coil made of 219 turns of single-strand copper wire, you use a motor to rotate the coil at a constant angular speed of 60.0 revolutions per second at various orientations and locations throughout the room. In one particularly signficant orientation, you notice a maximum induced voltage of 2.15 V appearing in the coil. If the radius of the coils is 1.00 cm, how strong was the magnetic field that produced this EMF? Number Can you rule out the possibility that unusually strong magnetic fields are causing the strange behavior? No, because the magnetic field producing the EMF is much stronger than the magnetic field of the Earth. Yes, because the magnetic field producing the EMF is about the same strength as that of the Earth. : Paranormal skeptics use other equipment to investigate claims of ghosts and poltergeists, such as videoExplanation / Answer
Here,
Number of turns ,N = 210
angular speed , w = 60 rev/s
w = 376.92 rad/s
maximum induced voltage , V = 2.15 V
radius of coil , r = 1 cm = 0.01 m
let the magnetic field is B
as V = N* B * A * w
2.15 = 210 * B * pi * 0.01^2 * 376.92
solving for B
B = 0.0865 T
the magnetic field needed is 0.0865 T
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No , because the magneti field producing the EMF is much stronger than the magnetic field at the earth
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