In using a Wheatstone’s bridge to accurately measure an unknown resistance, a calibrated known variable resistor is varied until
A. the change in the galvanometer reading is zero
B. a change in the value of the variable resistor produces no change in the galvanometer reading
C. the potential difference across the unknown resistance is zero
D. the potential difference across the galvanometer is zero.
Answer:D
In using a Wheatstone’s bridge to accurately measure an unknown resistance, a calibrated known variable resistor is varied until
A. the change in the galvanometer reading is zero B. a change in the value of the variable resistor produces no change in the galvanometer reading C. the potential difference across the unknown resistance is zero D. the potential difference across the galvanometer is zero.