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Complex Numbers question

2019 · 12 Jan · Shift 1 · Q26

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PYQ Library
JEE Main
Mathematics
Complex Numbers
2019 · 12 Jan · Shift 1 · Q26

Complex Numbers question

2019 · 12 Jan · Shift 1 · Q26

JEE MainMathematicsComplex NumbersMCQ+4 / −1

If

{{z - \alpha } \over {z + \alpha }}\left( {\alpha \in R} \right)

is a purely imaginary number and | z | = 2, then a value of

\alpha

is :

A
${1 \over 2}$
B
$\sqrt 2$
C
2
D
1

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