Finding the Locus of z for R: A Real Number

  • Thread starter Thread starter Mentallic
  • Start date Start date
Click For Summary
SUMMARY

The locus of z defined by the equation z=\frac{1+iR}{1-iR} for real number R is determined to be a unit circle in the complex plane. By simplifying the expression, it is shown that the real part x=\frac{1-R^2}{1+R^2} and the imaginary part y=\frac{2R}{1+R^2} lead to the conclusion that |z|=1. This indicates that all values of z lie on the unit circle, confirming that the locus is indeed a circle with a radius of 1 centered at the origin.

PREREQUISITES
  • Understanding of complex numbers and their representation
  • Familiarity with algebraic manipulation of fractions
  • Knowledge of the concept of modulus in complex analysis
  • Basic skills in graphing complex functions
NEXT STEPS
  • Explore the properties of complex functions and their loci
  • Learn about the geometric interpretation of complex numbers
  • Study the concept of transformations in the complex plane
  • Investigate the implications of the modulus of complex numbers
USEFUL FOR

Students studying complex analysis, mathematicians interested in geometric interpretations, and educators teaching advanced algebra concepts.

Mentallic
Homework Helper
Messages
3,802
Reaction score
95

Homework Statement


If R is a real number, find the locus of z defined by:

[tex]z=\frac{1+iR}{1-iR}[/tex]

Homework Equations


[tex]z=x+iy[/tex]

The Attempt at a Solution


[tex]z=(\frac{1+iR}{1-iR})(\frac{1+iR}{1+iR})[/tex]

[tex]=\frac{1-R^2+i2R}{1+R^2}[/tex]

Therefore, [tex]x=\frac{1-R^2}{1+R^2}[/tex]

and [tex]y=\frac{2R}{1+R^2}[/tex]

I'm unsure what to do now though...
 
Physics news on Phys.org
Hmmm... why not compute [tex]|z|[/tex] and see if that gives you anything useful:wink:
 
Everything just fell into place and [tex]|z|=1[/tex]. How did you know that would happen? lol
 

Similar threads

  • · Replies 5 ·
Replies
5
Views
1K
  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 19 ·
Replies
19
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
14
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 12 ·
Replies
12
Views
3K
  • · Replies 23 ·
Replies
23
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K