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Unformatted text preview: Q 26.23) In the circuit shown find a) the current in the 3.00 ohm resistor; b) the unknown emfs ε 1 ε 2 ; c) the resistance R . Note that the three currents are given Answers: Apply the junction rule at points a, b, c and d to calculate the unknown currents. Then apply the loop rule to three loops to calculate ε 1 ε 2 and R . The circuit is sketched along with the loops chosen and direction of currents chosen. Apply the junction rule to point a where positive current goes toward the junction point a : 3 3.00 A 5.00 A I + = 3 8.00 A I = Apply the junction rule to point b : 4 2.00 A 3.00 A I + = 4 1.00 A I = Apply the junction rule to point c : 3 4 5 I I I = 5 3 4 8.00 A 1.00 A 7.00 A I I I = = = As a check, apply the junction rule to point d : 5 2.00 A 5.00 A I = Answer b) Next apply the loop rule to loop (1): ( 29 ( 29 ) 00 . 3 ( . 4 00 . 3 3 1 = Ω Ω I A ε ( 29 ( 29 V A V . 36 00 . 3 00 . 8 12 1 = Ω + = ε Apply the loop rule to loop (2): ( 29 ( 29 ) 00 . 3 ( . 6 00 . 5 3 2 = Ω Ω I A ε ( 29 ( 29 V A V . 54 00 . 3 00 . 8 . 30 2 = Ω + = ε c) Answer:...
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This note was uploaded on 10/05/2011 for the course PHYS 4B taught by Professor W.christensen during the Summer '09 term at Irvine Valley College.
 Summer '09
 W.CHRISTENSEN
 Physics, Current, Resistance

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