MULTIPLE CHOICE ONLY NUMBERS 1-5 1. As per Faraday's laws of electromagnetic induction, an emf is induced in a conductor whenever itA. lies perpendicular to the magnetic flux.B. lies in a magnetic field.C. cuts magnetic flux.D. moves parallel to the direction of the magnetic fielc2. When current runs through a wire, a magnetic field is created. However, computer cables create little tono magnetic field external to their insulation. How is this possible? (Hint: computer cables containmultiple wires inside)A. The cables are insulated with plastic.B. The supply and return cables run anti parallel and their magnetic fields essentially cancel out.C. The supply and return cables run parallel and their magnetic fields essentially cancel out.D. The currents are too small to create a significant magnetic field.3. A square loop of wire with 10 turns and a side length of 1 m is placed in a changing magnetic field. If themagnetic field changes from 2 T to 4 T within 8 seconds, what is the average induced emf?A. 1.25 VВ. 2.5 VC. O VD. 5 V4. A 500-turn solenoid develops an average induced voltage of 60 V. Over what time iterval must a fluxchange by 0.06 Wb occur to produce such a voltage?B. 0.1 sA. 0.01 sC 0.5 sD. 5 s5. A current may be induced in a coil byA. moving one end of the bar through the coil.B. moving the coil toward the one end of the bar magnet.C. holding the coil near a second coil while the electric current in the second.D. all of the above.6. What happens when two polarizing filters are placed so that their axes of polarization. Are perpendicularto each other?A. Transmitted light is slightly weakerB. There is no transmitted lightC. Transmitted light are polarized.D. Transmitted light oscillates in all direction.7. On rotating the analyzer if the intensity of light rays coming out of it varies from maximum to zero. Whathappens to the incident beam of light?A. unpolarizedB. plane polarizedC. partially polarized D. polarized8. Three polarized are placed such that, the first and the third are mutually perpendicular to each other.Unpolarized light of intensity Io is incident or first polarized. The intensity of light emerging from the thirdpolaroid's is (1/16) of the intensity of incident light. What is the angle between first the angle between firstand second polaroid?A. a= 24.50B. a= 25.6°Ca= 30.50D. a= 31.509. The use of two filters, one can completely block all of the light that is incident upon'the set. What shouldbe the orientation of the polarization axes?A. Parallel to each otherC. Opposite to each otherD. near each otherB. perpendicular to each other.

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1. As per Faraday's laws of electromagnetic induction, an emf is induced in a conductor whenever it A. lies perpendicular to the magnetic flux. B. lies in a magnetic field. C. cuts magnetic flux. D. moves parallel to the direction of the magnetic fielc 2. When current runs through a wire, a magnetic field is created. However, computer cables create little to no magnetic field external to their insulation. How is this possible? (Hint: computer cables contain multiple wires inside) A. The cables are insulated with plastic. B. The supply and return cables run anti parallel and their magnetic fields essentially cancel out. C. The supply and return cables run parallel and their magnetic fields essentially cancel out. D. The currents are too small to create a significant magnetic field. 3. A square loop of wire with 10 turns and a side length of 1 m is placed in a changing magnetic field. If the magnetic field changes from 2 T to 4 T within 8 seconds, what is the average induced emf? A. 1.25 V В. 2.5 V C. O V D. 5 V

1. As per Faraday's laws of electromagnetic induction, an emf is induced in a conductor whenever it A. lies perpendicular to the magnetic flux. B. lies in a magnetic field. C. cuts magnetic flux. D. moves parallel to the direction of the magnetic fielc 2. When current runs through a wire, a magnetic field is created. However, computer cables create little to no magnetic field external to their insulation. How is this possible? (Hint: computer cables contain multiple wires inside) A. The cables are insulated with plastic. B. The supply and return cables run anti parallel and their magnetic fields essentially cancel out. C. The supply and return cables run parallel and their magnetic fields essentially cancel out. D. The currents are too small to create a significant magnetic field. 3. A square loop of wire with 10 turns and a side length of 1 m is placed in a changing magnetic field. If the magnetic field changes from 2 T to 4 T within 8 seconds, what is the average induced emf? A. 1.25 V В. 2.5 V C. O V D. 5 V

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter11: Magnetic Forces And Fields

Section: Chapter Questions

Problem 104CP: A particle’s path is bent when it passes through a region of non-zero magnetic field although its...

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Unreasonable results To construct a non-mechanical water meter, a 0.500-T magnetic field is placed across the supply water pipe to a home and the Hall voltage is recorded, (a) Find the flow rate through a 3.00-cm-diameter pipe if the Hall voltage is 60.0 mV. (b) What would the Hail voltage be for the same flow rate through a 10,0-cm- diameter pipe with tire same field applied?
A particle’s path is bent when it passes through a region of non-zero magnetic field although its speed remains unchanged. This is very useful for “beam steering’’ in particle accelerators. Consider a proton of speed 4106m/s entering a region of uniform magnetic field 0.2 T over a 5-cm-wide region. Magnetic field is perpendicular to the velocity of the particle. By how much angle will the path of the proton be bent? (Hint: the particle comes out tangent to a circle.
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A nonmechanical water meter could utilize the Hall effect by applying a magnetic field across a metal pipe and measuring the Hall voltage produced. What is the average fluid velocity in a 3.00-cm-diameter pipe, if a 0.500-T field across it creates a 60.0-mV Hall voltage?
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