In Figure, R1=6.0ΩR_{1}=6.0 \Omega, R2=18.0ΩR_{2}=18.0 \Omega, and the ideal battery has emf ε=12.0V\varepsilon=12.0\rm{V}. What are the (a) size and (b) direction (left or right) of current i1i_{1}? (c) How much energy is dissipated by all four resistors in 1.00min1.00 \rm{min}?

Your answers:

(a) the size of the current i1i_{1}is [Fill in the blank],
A\rm{A}

(b) direction (left or right) of the current i1i_{1} is [Fill in the blank],

(c) the energy dissipated by all four resistors in 1.00min1.00 \rm{min} is [Fill in the blank],
J\rm{J}

Question

In Figure, R1=6.0ΩR_{1}=6.0 \Omega,  R2=18.0ΩR_{2}=18.0 \Omega, and the ideal battery has emf ε=12.0V\varepsilon=12.0\rm{V}. What are the (a) size and (b) direction (left or right) of current i1i_{1}? (c) How much energy is dissipated by all four resistors in 1.00min1.00 \rm{min}?

Your answers:

(a) the size of the current i1i_{1}is [Fill in the blank],
A\rm{A}

(b) direction (left or right) of the current i1i_{1} is [Fill in the blank],

(c) the energy dissipated by all four resistors in 1.00min1.00 \rm{min} is [Fill in the blank],
J\rm{J}

BlackTom AI · Accepted Answer

The provided item is a fill-in-the-blank problem with no explicit answer choices to analyze, so I will lay out a clear, step-by-step approach to solve the circuit quantities asked, and point out what information is required and how to use it.

First, restate what is being asked:
- (a) Find the magnitude of the current i1 in the circuit.
- (b) Determine the direction of i1 (left or right).
- (c) Compute the total energy dissipated by all four resistors in 1.00 min.

Next, parse the given values and the circuit layout:
- R1 = 6.0 Ω
- R2 = 18.0 Ω
- The ideal battery has emf ε = 12.0 V
- The diagram shows a battery, a top resistor labeled R1, and a lower network with resistors labeled R2 in some configuration. The exact connectivity of the resistors (how many R2, whether they’re in series or parallel, and how i1 flows through them) is crucial for computing currents and total power, but the textual description alone isn’t unambiguous.

Because the exact wiring of the R2 components and the path of i1 are essential to determine (a) and (b), the following steps show how you would proceed once the circuit connectivity is confirmed:
- Step 1: Identify the circuit topology. Determine which resistors are in series and which are in parallel, and locate the branch through which i1 flows. If there are two R2 resistors in parallel or in a ladder arrangement, note the node connections carefully.
- Step 2: Simplify the resistor network to a single equivalent resistance R_eq as seen by the emf source. This typically involves combining resistors in series (R_series = R_a + R_b) and parallel (R_parallel = 1 / (1/R_a + 1/R_b)). If R2s are arranged in a more complex network, you may need node-voltage or loop-current methods.
- Step 3: Compute the total current I from the battery using Ohm’s law: I = ε / R_eq. This I is the current supplied by the battery and the same current that flows through any series path; however, in a network with branching, you must apply Kirchhoff’s laws to resolve branch currents, including i1.
- Step 4: Determine i1’s magnitude and direction. Identify which branch i1 is defined in and use the sign conventions (positive in the indicated direction) to deduce the actual direction. If i1 is defined going leftward through a particular resistor, a positive i1 means current flows left; a negative value means it flows right.
- Step 5: Find the power dissipated by all resistors. The energy dissipated in time t is P_total × t, where P_total is the sum of power dissipated by each resistor. Alternatively, compute total resistance and use P = I^2 R_eq, then multiply by the time period to get energy. Note t = 1.00 min = 60 s, so energy E = I^2 R_eq × 60 s.

Important caveat about potential pitfalls:
- If you treat R1 and the R2 network as simply in series with the emf, you may misapply the parallel combinations and obtain an incorrect I and i1. Ensure the network’s node connections are correctly interpreted from the diagram.
- If i1 is defined in a specific branch of the R2 network, do not assume it equals the source current. Branch currents split according to the local equivalent resistances, so you must solve for i1 using the network equations.

To proceed numerically, you would need a precise description or a clearer schematic of how the four resistors (one R1 and three R2s if that’s the intended count) are connected. If you can confirm the exact topology (for example: is there a single R1 in the top branch in series with the source, and three R2 resistors arranged as two in parallel in the bottom network with one linking node to R1’s far end?), I can compute:
- the numeric value of i1 (magnitude and sign to indicate direction), and
- the energy dissipated in 60 s (in joules).

In summary, the method is straightforward once topology is clarified: determine R_eq, find I from ε / R_eq, resolve i1 via branch currents with Kirchhoff’s laws, decide direction from the defined orientation, and finally compute energy as E = I^2 R_eq × 60 s (or sum P_i × 60 s for each resistor). If you provide the exact connectivity or a clarified schematic, I will fill in the numerical answers for (a), (b), and (c) with detailed calculations.

190865 Electricity And Magnetism Final Exam (comprehensive)

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