NEET Questions Solved


In the circuit shown here, what is the value of the unknown resistor R so that the total resistance of the circuit between points P and Q is also equal to

(1) 3 ohms

(2) 39ohms

(3) 69ohms

(4) 10 ohms

(3) The given circuit can be simplified as follows

R=3+10×(3+R)10+3+R=3+30+10R13+R

R=39+3R+30+10R13+R=69+13R13+R

13R+R2=69+13R

R=69Ω.

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