(b) Resistance across $XY = \frac{2}{3}\Omega$ Total resistance $= 2 + \frac{2}{3} = \frac{8}{3}\Omega$ Current through ammeter $= \frac{2}{8/3} = \frac{6}{8} = \frac{3}{4}A$
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Ph.D. in Physics with 19+ years of teaching experience.