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Faraday's Law of Induction: induced current

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Suppose the current in the infinite long straight circuit C of Figure 13-5 is given by, see attached, Find the induced emf that will be produced in the rectangular circuit of this same figure. What is that direction of the induced current.

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The expert examines Faraday's law of induction for induced current.

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Magnetic flux density at a distance x from the infinite current carrying conductor is given by:

B = μoI'/2Пx

Let us consider a strip of infinitesimally small width dx as shown in the fig..

Area of the strip = dA = bdx

Flux through the strip = dφ = BdA = [μoI'/2Пx]bdx

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