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Q#1 Potentiometer and Q-Meter GATE EE 1992 MCQ +1 mark -0.33 marks

In d.c. potentiometer measurements, a second reading is often taken after reversing the polarities of the d.c. supply and the unknown voltage, and the average of the two reading is taken. This is with a view to eliminate the effects of

Ripples in the d.c. supply

Stray magnetic fields

Stray thermal emf’s

Erroneous standardization

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