Question: Q. 4. The reading of the (ideal) ammeter, in the circuit shown here, is equal too.

(i) I when key K1 is closed but key K2 is open.

(ii) I2 when both keys K1 and K2 are closed.

Find the expression of the resistance of X in terms of the resistances of R and S.

U] [Delhi Comptt. 2016]

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Solution:

Ans. (i) Current I when K2 is open

I=ER+X

(ii) Current I when K2 is closed

I=ER+(SX)E(S+X)R(S+X)+SX1/2

Current flowing through X,

I2=ISS+X=ESR(S+X)+SX E2(R+X)=ESR(S+X)+SX 2(R+X)S=R(S+X)+SX 2RS+2XS=RS+RX+SX RS=RXSX X=RS(RS)

+9332×2=VAD VAD=3 V [ Alternatively through path AFD] 32×2=VAD VAD=3 V [CBSE Marking Scheme, 2012] 



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