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When a pentavalent material like As, is added to tetravelent material i.e. Ge we get a __________. (n-type material, p-type material, Semiconductors, None of these)

Asked by Narendra Kumar Sharma 18/02/2015 Last Modified 18/02/2015

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A wire 2.5 m long is bent into a square. An current of 100 A flowing through the wire will produce a magnetizing force at the center of the square, equal to a.) 72 AT / m. b.) 144 AT / m. c.) 196 AT / m. d.) 222 AT / m.

Solution: Wire length l=2.5 m; Current i = 100 A; Magnetizing force h = ?. In square, length of each side; 2a = l / 4 ? a = 2.5 / 8 = 0.3125 h= sqrt(2) . i/ ( pi a) =sqrt(2) .100/(pi . 0.3125) =44 AT/m

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