A Wheatstone’s bridge is balanced with a resistance of 625Ω in the third arm, where P, Q and S

A Wheatstone’s bridge is balanced with a resistance of 625Ω in the third arm, where P, Q and S are in the 1^st , 2^ndand 4^tharm respectively. If P and Q are interchanged, the resistance in the third arm has to be increased by 51 Ω to secure balance. The unknown resistance in the fourth arm is

(A) 625Ω

(B) 650 Ω

(D) 600 Ω

A Wheatstone’s bridge is balanced with a resistance of 625Ω in the third arm, where P, Q and S

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