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$4.7 \times 10^6 \textrm{ N/C, } 45^\circ \textrm{ below the x-axis}$
Note that the video has an error in the final calculation where I missed squaring the denominator. Everything else in the video is correct, and the proper final answer is shown above.

Giancoli 6th Edition, Chapter 16, Problem 33

(2:48)

Chapter 16, Problem 33 is solved.

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Comments

According to the answer provided at the back of my textbook, the answer should be 4.70e6 N/C at 45 degrees.

I received the same answer of 4.7e6 N/C. Even when doing the calculations above I received 4.7e6 N/C

Solution manual has 4.7e6 as well.

Thanks for the heads up on this everyone. I forgot to square the denominator in the final calculation. I've updated the text answer, with a note about this error in the video for the final calculation.