Q44 / 108 · NTA Abhyas (JEE Main) 2020 · Mathematics · Complex Number

For a complex number Z, if Z=π41+i41-πiπ+i+π-i1+πi, then the value of ZampZ is equal to (where ampZ∈-π,π)

  • A
    π
  • Correct answer
    B
    4
  • C
    1
  • D
    3π

Solution

Z=π41+i221-πi1+πi+π-iπ+iπ+πi+i-π

⇒Z=π41-1+2i21+π+π+1π+1i

⇒Z=π44-12i=-2πi=2πi

⇒Z=2π and ampZ=π2

⇒ZampZ=4

Hence, the correct answer is option: 'B'.

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