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A complex quantity \( Z \) is given as \( Z = -8 - j6 \). Calculate the phase angle (in degrees) for this complex number. Select all the correct answers.

A. -143.1
B. 36.9
C. 143.1
D. 216.9
E. 323.1

Answer :

Final answer:

To calculate the phase angle of a complex number, use the formula arctan(Imaginary Part / Real Part). For Z = -8 - j6, the phase angle is 36.9 degrees. The correct option is b.

Explanation:

To calculate the phase angle of a complex number, we use the formula:

Phase Angle = arctan(Imaginary Part / Real Part)

In this case, the complex number Z = -8 - j6. The real part is -8 and the imaginary part is -6. Plugging these values into the formula, we get:

  • Phase Angle = arctan(-6 / -8) = arctan(0.75)

Now, using a calculator, we can determine the value of this angle:

  • Phase Angle = 36.87 degrees

Therefore, the correct answer is b. 36.9 degrees.

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