If z is a complex number of constant modulus such that $z^{2}$ is purely imaginary then the number of possible values of z is?

2

1

4

Infinite

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If z is a complex number of constant modulus such that

z^{2}

is purely imaginary then the number of possible values of z is?

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Question Text

If z is a complex number of constant modulus such that

z^{2}

is purely imaginary then the number of possible values of z is?

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