3 A null point is obtained when two resistors of resistance

Last updated: 6/24/2023

3 A null point is obtained when two resistors of resistance r each are connected in series and placed in the fourth arm of a Wheatstone bridge Now the resistance R of the third arm is kept fixed and r connected in parallel are placed in the fourth arm Then a null point is obtained only by interchanging the resistances P and Q of the first two arms Find the ratio of P and Q and also the value of r R