Two resistances R1 and R2 give combined resistance of 4.5 Ω when in series and 1 Ω when in parallel The resistances are
A. 1.5 Ω and 0.5 Ω
B. 1.5 Ω and 3 Ω
C. 2 Ω and 6 Ω
D. 3 Ω and 9 Ω
Answer:B
Two resistances R1 and R2 give combined resistance of 4.5 Ω when in series and 1 Ω when in parallel The resistances are
A. 1.5 Ω and 0.5 Ω B. 1.5 Ω and 3 Ω C. 2 Ω and 6 Ω D. 3 Ω and 9 Ω