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E Safari File Edit View History Bookmarks Window Help R R & 619% O Wed 12:41 AM Kapri Moore a E A session.masteringphysics.com HW4 - Current & resistance Problem 19.79 Resources D A * previous 22 of 22 return to assignment PHYSICS IN Problem 19.79 Part A What must the emf E in the figure (Figure 1) be in order for the current through the 7.00 N resistor to be 1.70 A ? Each ef source has negligible internal resistance Express your answer in volts to three significant figures. I VO Azp sh a CD ? 23-24 CHE E-10.9 Submit My Answers Give Up Figure 1 of 1 incorrect; Try Again; 3 attempts remaining Ho OBAL SAOS Pose respons Continue 24.0 v ET 7.00 0 INDOM S 3.00 N 2.00 0 sc 415 Screen Shot Opt Chap 22 2017-10... 0.47 AM respirat.. 42-2.ppt PHYSICS 2 JOO 3 I 0 1 R & R CS C A at 91 @ 0 0 0 1 3* ? Agudu INTERNSHIP SPRING 2018 am A

Explanation / Answer

from clockwise outer loop

24 V - (7 * 1.7) - (I1 * 3) = 0

I1 = 4.03 A

solving E using the loop around the battery, 7 ohm resistor and 2 ohm resistor

E = 2(I2 - I1 ) + 7 I2

= 2 (1.7 - 4.03) + (7 * 1.70)

E = 7.23 V

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