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Chapter 22: Faraday's Law

Matter & Interactions
Pages: 902 - 938

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17 Questions for Chapter 22: Faraday's Law

  1. Figure 22.52 shows four different ways to connect the copper wire. Based on the analysis we have just carried out, involving identifying whether or not there is a battery-like emf in a loop, what is the brightness of both bulbs in circuits 1,2,3and 4?

    Found on Page 928
  2. Would the inductance ‘of a solenoid be larger or smaller if the solenoid is filled with iron? Explain briefly.

    Found on Page 932
  3. A magnetic field near the floor points up and is increasing. Looking down at the floor, does the non-Coulomb electric field clockwise or counter clockwise? A magnetic field near the ceiling points down and is decreasing. Looking up at the ceiling, does the non-Coulomb electric field curl clockwise or counter clockwise?

    Found on Page 903
  4. In Figure 22.72 a toroid has a rectangular cross section with an inner radius r1=9cm, an outer radius r2=12cm, and a height h=5cm, and it is wrapped around by many densely packed turns of current-carrying wire (not shown in the diagram). The direction of the magnetic field inside the windings is shown on the diagram. There is essentially no magnetic field outside the windings. A wire is connected to a sensitive ammeter as shown.

    Found on Page 934
  5. Question: A thin rectangular coil lies flat on a low-friction table (Figure 22.75). A very long straight wire also lies flat on the table, a distance zfrom the coil. The wire carries a conventional current lto the right as shown, and this current is decreasing: I=a-bt, where tis the time in seconds, and aand bare positive constants. The coil has length Land width w, where w << z. It has Nturns of wire with total resistance

    Found on Page 935
  6. Two coils of wire are near each other, positioned on a common axis (Figure 22.57). Coil 1 is connected to a power supply whose output voltage can be adjusted by turning a knob so that the current I1in coil 1 can be varied, and I1is measured be ammeter 1.

    Found on Page 931
  7. :A uniform magnetic field of 3 T points300 away from the perpendicular to the plane of a rectangular loop of wire 0.1 m by 0.2 m (Figure 22.14). What is the magnetic flux on this loop?

    Found on Page 906
  8. Two metal rings lie side-by-side on a table (Figure 22.59). The current in the left ring runs clockwise and is increasing with time, so a current runs in the right ring. Does this current run clockwise or counterclockwise? Explain, using a diagram. (Hint: Think carefully about the direction of magnetic field in the right ring produced by the left ring, taking into consideration what sections of the left ring are closest.)

    Found on Page 931
  9. A wire of resistance 10 Ω and length 2.5 m is bent into a circle that is concentric with and encircles a solenoid in which the magnetic flux changes from 5T.m2to 3T.m2in 0.1 s. What is the emf in the wire? What is the non-Coulomb electric field in the wire? What is the current in the wire?

    Found on Page 907
  10. A very long straight wire (essentially infinite in length) carries a current of 6ampere (Figure 22.60). The wire passes through the center of a circular metal ring of radius 2cmand resistance 2Ωthat is perpendicular to the wire. If the current in the wire increases at a rate of 0.25A/s, what is the current in the ring? Explain carefully.

    Found on Page 931

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