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What is the value of λ for which the vectors  and  are perpendicular?

  1. 21
  2. -18
  3. -22
  4. 22

Answer (Detailed Solution Below)

Option 3 : -22
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Detailed Solution

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Concept:

If vectors  are perpendicular then 

 

Calculation:

Given:  and  are perpendicular

Let  and 

We know that, If vectors  are perpendicular then 

⇒ -2 - 20 - λ = 0 

⇒ -22 - λ = 0 

∴ λ = -22

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Last updated on Jul 1, 2025

-> The Indian Army has released the Exam Date for Indian Army Havildar SAC (Surveyor Automated Cartographer).

->The Exam will be held on 9th July 2025.

-> Interested candidates had applied online from 13th March to 25th April 2025.

-> Candidates within the age of 25 years having specific education qualifications are eligible to apply for the exam.

-> The candidates must go through the Indian Army Havildar SAC Eligibility Criteria to know about the required qualification in detail. 

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