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A washer is made of metal having resistivity 10–7 Ωm. The washer has inner radius 1 cm, outer radius 3 cm and thickness 1 mm. A magnetic field, oriented normal to the plane of the washer, has the time dependent magnitude B = (2t) tesla/sec. Find the current (in ampere) around the washer.
(a) 2 amp(b) 4 amp(c) 6 amp(d) 8 amp
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