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Questions  

In the network shown, when switch S is open, power dissipated in the circuit is 15 W. When S is closed, power dissipated in the circuit is 20 W. The R3 is

 

a
5 Ω
b
4.6 Ω
c
1.67 Ω
d
2.12 Ω

detailed solution

Correct option is C

R1+R2+R3=10215 and R1+R2=10220∴R3=10015-10020 Ω=1.67 Ω

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