→A=i∧ -2j∧ + 3k∧ এবং →B=2i∧ +j∧-K∧ হলে, →A.→B

Question

→A=i∧ -2j∧ + 3k∧   এবং    →B=2i∧ +j∧-K∧ হলে, →A.→B

Accepted Answer

সঠিক উত্তর: -3। ব্যাখ্যা:

$\underset{A}{\to} = i^{\land} - 2 j^{\land} + 3 k^{\land}$ এবং $\underset{B}{\to} = 2 i^{\land} + j^{\land} - K^{\land}$ হলে, $\underset{A}{\to} . \underset{B}{\to}$