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JEE Main 202227 JuneEvening Shift
Exam
JEE Main
Year
2022
Date
27 June
Shift
Evening Shift
Subject
Mathematics
Chapter
Complex Number

JEE Main 2022 · 27 June · Evening Shift · Mathematics · Complex Number

The number of points of intersection |z - (4 + 3i) | = 2| and |z| +...

The number of points of intersection \left|z -\left(4 + 3i\right)| = 2\right| and \left|z\right| + \left|z - 4\right| = 6, z \in C isThe number of points of intersection |z - (4 + 3i) | = 2| and |z| + |z - 4| = 6, z ∈ C is

Options

  1. A11
  2. B22
  3. C33
  4. D44

Correct answer

B. 22

Step-by-step solution

Clearly, ∣z−(4+3i)∣=2\left|z - \left(4 + 3i\right)\right| = 2 represents a circle with centre \left(4, 3\right)andradiusand radius2unitsand∣z∣+∣z−4∣=6units and \left|z\right| + \left|z - 4\right| = 6 represents an ellipse with foci \left(0, 0\right) and \left(4, 0\right)andverticesare(5,0)and vertices are \left(5, 0\right) and \left(- 1, 0\right) .

Observe that, z=(4+i)z = \left(4 + i\right) lies on circle and \left|4 + i\right| + \left|4 + i - 4\right| = 1 + \sqrt{17} < 6.</p><p>Hence,thepoint.</p><p>Hence, the pointz = \left(4 + i\right) lies inside the ellipse.

So, the graphs of the curves are as shown in figure.

The number of points of intersection |z - (4 + 3i) | = 2| and |z| + |z - 4| = 6, z ∈ C is

It is clear from the above diagram, there exist two complex numbers which satisfy both the given curves.

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