I am not sure how they are getting -2 as the answer. Could someone please explai

Question

I am not sure how they are getting -2 as the answer. Could someone please explain? Thank you so much!

ek Safari File Edit View History Bookmarks window Help L S t 4 100% Thu 10:02 AM Q. E e O O Learning Catalytics https learningcatalytics.com sessions/48848685/review Document m EEEE Past Exam: P...F: Koofers Apple Disney ESPN Yahoo Physics practice problems Google Search Learning Catalytics The curren n the fourth wire is A. Enter a posit current equation C. The bulbs are equally bright. Details ighest to March 2017 4:56 PM Hide Details The current in the fourth wire is A. Enter a positive value if it's to the right, negative if it's to the left. 5 A negative 2 A 9 A Answer Showing Copyright Statemen

Explanation / Answer

if we look at origin, the current 5A and 2 A are joining and net outflow from that junction should be 7 A.

The out flow consist of two parts , 9 A and x ( where x is the current in 4 th wire)

7 = 9A + x

x= 7-9 = -2 A ( this is how you get the answer)

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