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Answer on Other Physics Question for DEEPENDRA SINGH

Question #68604
Let A vector=icapAcosu+jcapAsinu is a vector. another vector, B vector is the perpendicular to A vector, then -
Expert's answer
B vector is the perpendicular to A vector, thus,
(iAcosu+jAsinu )(iBcosu+jBsinu)=AB(cos^2⁡u+sin^2⁡u )=AB≠0
(iAcosu+jAsinu )(iBsinu-jBcosu)=AB(cosusinu-sinucosu)=0
Thus, the second choice is true.
Answer: 2. iBsinu-jBcosu.

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