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If (5z2)/(7z1) is purely imaginary , th...

If `(5z_2)/(7z_1)` is purely imaginary , then `|(2z_1+3z_2)/(2z_1-3z_2)|=`

A

`5//7`

B

`7//9`

C

`25//49`

D

1

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The correct Answer is:
D
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AAKASH SERIES-COMPLEX NUMBERS-EXERCISE -II
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  2. If (1 + cos theta - isin theta) ( 1+ cos 2 theta + isin 2 theta) = x +...

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  3. If (5z2)/(7z1) is purely imaginary , then |(2z1+3z2)/(2z1-3z2)|=

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  4. If alpha and betaare different complex numbers with |beta| =1 , then |...

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  5. If z(1) , z(2) are two complex numbers satisfying |(z(1) - 3z(2))/(3 -...

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  6. If |z-4/z|=2 , then the maximum value |z| is equal to

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  7. The minimum value of |z-1|+ |z-5| is

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  8. If |z + 2- i| = 5 then the maximum value of |3z- 9 - 7i| is

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  9. The minimum value of |z - 1| + | z- 2| + |z -3| + |z - 4|+ |z - 5| i...

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  10. If |z+ 4| le 3 then the maximum value of |z + 1|

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  11. If |z(1)| = |z(2)| = |z(3)| = … |z(n)| = 1 , then |z(1) + z(2) + z(3) ...

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  12. If the equation (1 + i)^(x) = 2^(x) , has integer solution , has the o...

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  13. If z is a complex number satisfying z^(4) + z^(3) + 2z^(2) + z + 1 = 0...

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  14. The complex number z satisfying z^(2) + |z| = 0 is

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  15. If z is a complex number satisfying the relation |z+1| = z + 2 (1 +i) ...

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  16. If z(1) , z(2) are conjugate complex numbers and z(3) , z(4) are also ...

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  17. If z(z), z(2) are two non-zero complex numbers satisfying |z(2)+z(2)|=...

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  18. If |z(1) + z(2)| = |z(1) - z(2)| then the difference in the arguments ...

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  19. The mod-amplitude form of (1 + 7i)/((2 - i)^(2)) is

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  20. The mod -amplitude form of 1+itan theta is

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