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Apply the junction rule at point a in Figure 21.55.

$I _ { 3 } = I _ { 2 } + I _ { 1 }$

Physics 102 Electricity and Magnetism

Chapter 21

Circuits, Bioelectricity, and DC Instruments

Direct-Current Circuits

Cornell University

Rutgers, The State University of New Jersey

Hope College

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Apply the junction rule to…

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Hello. So for this problem were asked to apply the junction goal. We'll start off with what? The junction rule states basically states that first Pacific junction the sum of all the current going into equals the sum of all the current coming out of it. So for this specific problem, we're just gonna focus on Junction A at this intersection and the currents coming in and coming out of it, we don't have to worry about any of the batteries or the resisters. So we have. I want coming up I to going to the right, and I three going up as well. So when we apply the junction rule, but first gonna look at the sum of all the current going into junction A and in this case, it would be just by three, because that's the only current pointing towards a. So for the right side of the equation, we would have I won and I too, because they're both pointing away or out from the junction. And because this is the sum of all the current coming out of junction of the junction we're gonna add, I want and I to So the answer to this question would be I three equals I want plus I to

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