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A thick straight copper wire, carrying a...

A thick straight copper wire, carrying a current of 10 A is bent into a semicircular arc of radius 7.0 cm as a shown in Fig (a). (i) State the direction and calculate the magnitude of magnetic field at the centre of arc. (ii) How would your answer change if the same wire were bent into a semicircular arc of the same radius but in opposite way as shown in Fig. (b)?

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