4 A wire is bent into three circular segments, each of

Chapter , Problem 24

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4 A wire is bent into three circular segments, each of radius r ! 10 cm, as shown in Fig. 30-48. Each segment is a quadrant of a circle, ab lying in the xy plane, bc lying in the yz plane, and ca lying in the zx plane. (a) If a uniform magnetic field points in the positive x direction, what is the magnitude of the emf developed in the wire when B increases at the rate of 3.0 mT/s? (b) What is the direction of the current in segment bc?

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