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Use the Formula 1R=1R1+1R2+1R3\frac { 1 } { R } = \frac { 1 } { R _ { 1 } } + \frac { 1 } { R _ { 2 } } + \frac { 1 } { R _ { 3 } }

Question 18

Multiple Choice

Use the formula 1R=1R1+1R2+1R3\frac { 1 } { R } = \frac { 1 } { R _ { 1 } } + \frac { 1 } { R _ { 2 } } + \frac { 1 } { R _ { 3 } } . Given R1=79.0ΩR _ { 1 } = 79.0 \Omega , R2=57ΩR _ { 2 } = 57 \Omega and R3=72ΩR _ { 3 } = 72 \Omega Find R.


A) R=27.9ΩR = 27.9 \Omega
B) R=22.7ΩR = 22.7 \Omega
C) R=16.1ΩR = 16.1 \Omega
D) R=19.1ΩR = 19.1 \Omega
E) R=21.1ΩR = 21.1 \Omega

Correct Answer:

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