# P,Q,R and S are the resistances taken in the cyclic order in a wheatstone bridge network. P and Q are ratio coils, S is the unknown resistance and R i

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P,Q,R and S are the resistances taken in the cyclic order in a wheatstone bridge network. P and Q are ratio coils, S is the unknown resistance and R is a 20Omega coil. A balance is obtained when R is shunted with a resistance of 350Omega. When P and Q are interchanged, the balance is restored by altering the shunt across R to 498Omega. find the resistance of S and the ratio P:Q.

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Correct Answer - 19.07Omega,1.007:1