NCERT Solutions for Class 12 Maths Chapter 10 Vector Algebra Ex 10.3 are part of NCERT Solutions for Class 12 Maths. Here we have given NCERT Solutions for Class 12 Maths Chapter 10 Vector Algebra Ex 10.3.

Board |
CBSE |

Textbook |
NCERT |

Class |
Class 12 |

Subject |
Maths |

Chapter |
Chapter 10 |

Chapter Name |
Vector Algebra |

Exercise |
Ex 10.3 |

Number of Questions Solved |
18 |

Category |
NCERT Solutions |

## NCERT Solutions for Class 12 Maths Chapter 10 Vector Algebra Ex 10.3

**Question 1.**

Find the angle between two vectors with magnitudes √3 and 2 respectively, and such that

**Solution:**

Angle θ between two vectors ,

**Question 2.**

Find the angle between the vectors

**Solution:**

Let

Let θ be the angle between ,

**Question 3.**

Find the projection of the vector , on the line represented by the vector ,

**Solution:**

let

**Question 4.**

Find the projection of the vector on the vector

**Solution:**

let then

**Question 5.**

Show that each of the given three vectors is a unit vector Also show that they are mutually perpendicular to each other.

**Solution:**

**Question 6.**

**Solution:**

Given

**Question 7.**

Evaluate the product :

**Solution:**

**Question 8.**

Find the magnitude of two vectors having the same magnitude and such that the angle between them is 60° and their scalar product is

**Solution:**

We know that

**Question 9.**

Find , if for a unit vector

**Solution:**

Given

**Question 10.**

If such that , then find the value of λ.

**Solution:**

Given

**Question 11.**

Show that for any two non-zero vectors

**Solution:**

are any two non zero vectors

**Question 12.**

If , then what can be concluded about the vector ?

**Solution:**

,

=> = 0

Hence b is any vector.

**Question 13.**

If are the unit vector such that , then find the value of

**Solution:**

We have

**Question 14.**

If either vector then . But the converse need not be true. Justify your answer with an example.

**Solution:**

Given:

To prove:

**Question 15.**

If the vertices A,B,C of a triangle ABC are (1,2,3) (-1,0,0), (0,1,2) respectively, then find ∠ABC.

**Solution:**

Let O be the origin then.

**Question 16.**

Show that the points A (1,2,7), B (2,6,3) and C (3,10, -1) are collinear.

**Solution:**

The position vectors of points A, B, C are

**Question 17.**

Show that the vectors and from the vertices of a right angled triangle.

**Solution:**

The position vectors of the points A, B and C are

and

**Question 18.**

If is a non-zero vector of magnitude ‘a’ and λ is a non- zero scalar, then λ is unit vector if

(a) λ = 1

(b) λ = – 1

(c) a = |λ|

(d) a =

**Solution:**

Given : is a unit vectors

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