SATHEE: Vectors 3 Question 25

Vectors 3 Question 25

25. For any three vectors $\vec{a}, \vec{b}$ and $\vec{c}$ ,

$(\vec{a} - \vec{b}) \cdot (\vec{b} - \vec{c}) \times (\vec{c} - \vec{a}) = 2 \vec{a} \cdot (\vec{b} \times \vec{c})$

$(1983, 1 M)$

Show Answer

Answer:

Correct Answer: 25. True

Solution:

$(\vec{a} - \vec{b}) \cdot (\vec{b} - \vec{c}) \times (\vec{c} - \vec{a}) = (\vec{a} - \vec{b}) \cdot (\vec{b} \times \vec{c} - \vec{b} \times \vec{a} + \vec{c} \times \vec{a})$

$\begin{aligned} = \vec{a} \cdot (\vec{b} \times \vec{c}) - \vec{b} \cdot (\vec{c} \times \vec{a}) & = [\vec{a} \vec{b} \vec{c}] + [\vec{a} \vec{b} \vec{c}] \\ = 2 [\vec{a} \vec{b} \vec{c}] = 2 \vec{a} \cdot (\vec{b} \times \vec{c}) \end{aligned}$

Hence, it is a true statement.

Play Store

App Store

Ask SATHEE

Welcome to SATHEE !
Select from 'Menu' to explore our services, or ask SATHEE to get started. Let's embark on this journey of growth together! 🌐📚🚀🎓

I'm relatively new and can sometimes make mistakes.
If you notice any error, such as an incorrect solution, please use the thumbs down icon to aid my learning.
To begin your journey now, click on "I understand".

Vectors 3 Question 25

25. For any three vectors a→,b→ and c→,

Answer:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Menu

25. For any three vectors $\vec{a}, \vec{b}$ and $\vec{c}$ ,