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$\bullet$ Find the emf's $\mathcal{E}_{1}$ and $\mathcal{E}_{2}$ in the circuit shown in Figure $19.58 .$

the emf $\varepsilon_{1}$ is $[18 \mathrm{V}]$the emf $\varepsilon_{2}$ is $[7.0 \mathrm{V}]$

Physics 102 Electricity and Magnetism

Chapter 19

Current, Resistance, and Direct-Current Circuit

Electric Charge and Electric Field

Gauss's Law

Electric Potential

Capacitance and Dielectrics

Current, Resistance, and Electromotive Force

Direct-Current Circuits

Electromagnetic Induction

University of Michigan - Ann Arbor

Hope College

McMaster University

Lectures

10:31

A capacitor is a passive two-terminal electrical component that stores electrical energy in an electric field. The effect of a capacitor is known as capacitance. The electrical charge stored in a capacitor is proportional to the potential difference between its terminals. A capacitor is defined as an electrical component that can store an electric charge. The effect of a capacitor is known as capacitance. The charge on a capacitor is directly proportional to the potential difference across its terminals. The unit of capacitance in the International System of Units (SI) is the farad (F), defined as one coulomb per volt. In electrical engineering, a common symbol for capacitance is the lowercase Greek letter "rho" (?). The capacitance of a capacitor is also expressed in farads.

18:38

In physics, electric flux is a measure of the quantity of electric charge passing through a surface. It is used in the study of electromagnetic radiation. The SI unit of electric flux is the weber (symbol: Wb). The electric flux through a surface is calculated by dividing the electric charge passing through the surface by the area of the surface, and multiplying by the permittivity of free space (the permittivity of vacuum is used in the case of a vacuum). The electric flux through a closed surface is zero, by Gauss's law.

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Find the emf in the circui…

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Use Fig. 17.57What emf…

We're giving a circuit. Let me try that. First, the current here is one ampere. The current here is to amperes which means the current here must be one appeared this veil That way these 21 amperes makes I do become too appears Andi values were given on one home. 21 six home one you won. For whom? One home. We simply your sketch ofthe law along this look first choosing loops on which Geoff's lock and be applied is a solution. Practice. Let's say if he if you choose this lobe this loophole contain both Even Andi do two on two unknowns of this loop is not the good best lope do you sketch of law? If you use this instead, you only have even on the equation you'll find even find Edo. You would use this slope this way. We are circumventing anyone. This If you would use this whole loop this way, you would circumvent even and you would have any question only with you. Now let's do this low. First has said Now let's start here. Let's start here. That is 21 1st then here. That's in the direction of current. So that's minus I R. Which is where the current, as you can see, is one times the resistance is one home. Then you go over here. Here you are in the opposite direction of the current, so that's a plus. I R is one amp times for home, then over here it's bless one times one and then over here it's minus even because we are, this is the opposite direction off the IMF. And then you have finally distress sister, which is where we are in the direction of the current, because this too ampere comes over here. It is one and we're going here on one and we're going here. So that's a minus. Guarding one AMP. Times, Reston's sixth form. You see it gives us a salon. One is equal to 20 minus one. That's four plus one minus six, which is 18. Board now for Part B, use the second larger loop. Let's start again at the same point. That's 20 fold minus one times one. Now for this one, we're in the direction of current. So that's, um, Highness, I is too ampere times one home here it's a minus. X Toronto here, that's a minus too ampere Times two on. Then we call that toa this sister again, which is minus one times six. This is equal to zero. Excuse us. Exit onto is 20 minus one minus to thanks. For my six, this is 30 which uses Absalon Toe is equal to sell involved.

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