का मान ______ के बराबर होगा। 

  1. 0
  2. |a|2
  3. 2|a|2
  4. 3|a|2

Answer (Detailed Solution Below)

Option 2 : |a|2
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Detailed Solution

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अवधारणा:

बिंदु गुणनफल: इसे आंतरिक गुणनफल या अदिश गुणनफल भी कहा जाता है

माना कि दो सदिश  और  हैं

दो सदिशों का बिंदु गुणनफल निम्न द्वारा दिया जाता है:  = |a||b| cos θ

जहाँ || = सदिश a का परिमाण, || = सदिश b का परिमाण और θ, a और b के बीच का कोण है

बिंदु गुणनफल के सूत्र:

 

गणना:

माना 

इसी प्रकार, 

इसलिए 

= xî + yĵ + zk̂ 

इसलिए, निम्न का आवश्यक मान

 

= (xî + yĵ + zk̂ ).(xî + yĵ + zk̂ )

= x2 + y2 + z2 = |a|2

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