An analog instrument has a specified accuracy of \(\pm 1%\) of full-scale reading. If its full-scale value is 300 V and it reads 120 V, the maximum percentage error with respect to the indicated reading is
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The absolute error remains constant at 3 V across the entire scale. As the measured voltage reading decreases, this fixed 3 V uncertainty becomes a larger percentage of the reading: \(\frac{3}{120} \times 100 = 2.5%\).