NCERT Solutions
Class 11 Maths
Complex Numbers and Quadratic Equations
Electric charges

Ex.5.1 Q.1

Express the given complex number in the form a + ib: (5i) (-3i ÷ 5).

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Ex.5.1 Q.2

Express the given complex number in the form a + ib: i9 + i19.

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Ex.5.1 Q.3

Express the given complex number in the form a + ib: i-39.

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Ex.5.1 Q.4

Express the given complex number in the form a + ib:  3(7 + i7) + i (7 + i7).

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Ex.5.1 Q.5

Express the given complex number in the form a + ib: (1 – i) – (–1 + i6).

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Ex.5.1 Q.6

Express the given complex number in the form a + ib: (  +  ) – (4 + ).

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Ex.5.1 Q.7

Express the given complex number in the form a + ib: [(  + ) + (4 + )] – (-  + i).

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Ex.5.1 Q.8

Express the given complex number in the form a + ib: (1 – i)4.

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Ex.5.1 Q.9

Express the given complex number in the form a + ib: (  + 3i)3

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Ex.5.1 Q.10

Express the given complex number in the form a + ib: (-2 – )3

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Ex.5.1 Q.11

Find the multiplicative inverse of the complex number 4 – 3i.

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Ex.5.1 Q.12

Find the multiplicative inverse of the complex number √5 + 3i.

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Ex.5.1 Q.13

Find the multiplicative inverse of the complex number -i.

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Ex.5.1 Q.14

Express the following expression in the form of a + ib.

{(3 + i√5) (3 - i√5)} ÷ {(√3 + i√2) - (√3 - i√2)}

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Ex.5.2 Q.1

Find the modulus and the argument of the complex number z = -1 - √3

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Ex.5.2 Q.2

Find the modulus and the argument of the complex number z = -√3 + i.

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Ex.5.2 Q.3

Convert the given complex number in polar form: 1 – i.

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Ex.5.2 Q.4

Convert the given complex number in polar form: -1 + i.

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Ex.5.2 Q.5

Convert the given complex number in polar form: -1 – i.

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Ex.5.2 Q.6

Convert the given complex number in polar form: -3.

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Ex.5.2 Q.7

Convert the given complex number in polar form: √3 + i.

 

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Ex.5.2 Q.8

Convert the given complex number in polar form: i.

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Ex.5.3 Q.1

Solve the equation x2 + 3 = 0

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Ex.5.3 Q.2

Solve the equation 2x2 + x + 1 = 0.

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Ex.5.3 Q.3

Solve the equation x2 + 3x + 9 = 0

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Ex.5.3 Q.4

Solve the equation –x2 + x – 2 = 0

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Ex.5.3 Q.5

Solve the equation x2 + 3x + 5 = 0.

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Ex.5.3 Q.6

Solve the equation x2 – x + 2 = 0

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Ex.5.3 Q.7

Solve the equation √2x2 + x + √2 = 0

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Ex.5.3 Q.8

Solve the equation √3x2 - √2x + 3√3 = 0

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Ex.5.3 Q.9

Solve the equation: x2 + x +  = 0.

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Ex.5.3 Q.10

Solve the equation x2 +  + 1 = 0

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Ex.Misc.Q.1

Evaluate: [i18 + ( )25]3.

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Ex.Misc. Q.2

For any two complex numbers z1 and z2, prove that

Re (z1z2) = Re z1 Re z2 – Im z1 Im z2

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Ex.Misc.Q.3

Reduce { { } to the standard form.

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Ex.Misc.Q.4

If x – iy = √ {(a - ib) ÷ (c - id)}, prove that (x2 + y2)2 = {(a2 + b2) ÷ (c2 + d2)}

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Ex.Misc.Q.5

Convert the following in the polar form:

(1) (1 + 7i) ÷ (2 - i)2                                        

(2) (1 + 3i) ÷ (1 – 2i)

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Ex.Misc.Q.6

Solve the equation 3x2 – 4x +  = 0

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Ex.Misc.Q.7

Solve the equation x2 – 2x +  = 0

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Ex.Misc.Q.8

Solve the equation 27x2 – 10x + 1 = 0

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Ex.Misc.Q.9

Solve the equation 21x2 – 28x + 10 = 0.

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Ex.Misc.Q.10

If z1 = 2 – i, z2 = 1 + i, find |z1 + z2 + 1|÷|z1 – z2 + i|.

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Ex.Misc.Q.11

If a + ib = (x + i)2 ÷ (2x2 + 1), prove that a2 + b2 = (x2 + 1)2 ÷ (2x + 1)2

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Ex.Misc.Q.11

Let z1 = 2 – i, z2 = -2 + i. Find

(1) Re {z1z2 ÷ }                                        

(2) Im (1 ÷ z1 )

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Ex.Misc.Q.12

Find the modulus and argument of the complex number (1 + 2i) ÷ (1 – 3i).

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Ex.Misc.Q.14

Find the real numbers x and y if (x – iy) (3 + 5i) is the conjugate of –6 – 24i.

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Ex.Misc.Q.15

Find the modulus of {(1 + i) ÷ (1 - i)} - {(1 - i) ÷ (1 + i)}.

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Ex.Misc.Q.16

If (x + iy)3 = u + iv, then show that:  +  = 4(x2 – y2).

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Ex.Misc.Q.17

If α and β are different complex numbers with |β| = 1, then find | (β - α) ÷ (1 - β) |

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Ex.Misc.Q.18

Find the number of non-zero integral solutions of the equation |1 – i|x = 2x

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Ex.Misc.Q.19

If (a + ib) (c + id) (e + if) (g + ih) = A + iB, then show that:

(a2 + b2) (c2 + d2) (e2 + f2) (g2 + h2) = A2 + B2

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Ex.Misc.Q.20

If {(1 + i) ÷ (1 - i)}m then find the least positive integral value of m.

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Complete NCERT Solutions: Classes 6 to 12, All Chapters

NCERT Solution for class 6
NCERT Solution for class 7
NCERT Solution for class 8
NCERT Solution for class 9
NCERT Solution for class 10
NCERT Solution for class 11
NCERT Solution for class 12

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