बिंदु A और B के स्थान सदिश क्रमशः 3î - 5ĵ + 2k̂ और î + ĵ - k̂ हैं। तो AB की लम्बाई क्या है?

  1. 11
  2. 9
  3. 7
  4. 6

Answer (Detailed Solution Below)

Option 3 : 7
Free
NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

Detailed Solution

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संकल्पना:

माना कि  है, तो  के सदिश का परिमाण =

गणना:

दिया गया है:

बिंदु A और B के स्थान सदिश क्रमशः 3î - 5ĵ + 2k̂ और î + ĵ - k̂ हैं। 

⇒   (î + ĵ - k̂) - (3î - 5ĵ + 2k̂)

अब,  की लम्बाई  

⇒  

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