Two resistors, R1 and R, are connected in the left gap and the right gap of a metre bridge, and the balancing length is obtained at 20 cm from the left. On inter-changing the resistors in the two gaps, the balancing length shifts by
A. 20 cm
B. 40 cm
C. 60 cm
D. 80 cm.
Answer:C
Two resistors, R1 and R, are connected in the left gap and the right gap of a metre bridge, and the balancing length is obtained at 20 cm from the left. On inter-changing the resistors in the two gaps, the balancing length shifts by
A. 20 cm B. 40 cm C. 60 cm D. 80 cm.