Mastering Physics: Chapter 19 Google Chrome Secure https:// session masteringphy

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Mastering Physics: Chapter 19 Google Chrome Secure https:// session masteringphysics.com/myct/itemview?assignment Problem 75670218 PHYS212-SPRING 2017 Help I Close Chapter 19 Problem 19.28 previous l 6 of 22 l next Problem 19.28 Part A Consider the circuit shown in (Figure 1). The batteries Determine the magnitudes of the cuments in each resistor shown in the figure. Ignore internal resistance of the batteries. have emfs of E 9.0 V and E2 12.0V and the Express your answers using two significant figures separated by commas. resistors have values of R 28 S2. R2 -67 S2. and 32 of Submit My Answers Give UD Part B Determine the directions of the currents in each resistor. lgnore internal resistance of the batteries 11 left. I2 right, 13 down O right, 12 left, 13 down In right, I left, I3 up 11 left, 12 right, 13 up Submit My Answers Give UD Part C n 7:53 PM 2121/2017 Ask me anything

Explanation / Answer

A)
let I1, I2 and I3 are the currents through R1,R2 and R3.

use KVL in upper loop,

E1 - I1*R1 - I2*R2 = 0

9 - 28*I1 - 67*I2 = 0 -----------(1)

use KVL in lower loop,

E2 - I3*R3 - I2*I2 = 0

12 - 32*I3 - 67*I2 = 0 ---------(2)

at the junction,

I1 + I3 = I2 --------(3)

on solving the above three equations

we get

I1 = 0.0177 A

I2 = 0.1269 A

I3 = 0.1092 A

B) I1 right,I2 left, I3 up

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