Page 126 - Bangladesh_classwiz_BOOK2018_rev_Neat

11.5 µm ¸Yb

`ywU †f±‡ii g‡a¨ Av‡iK cÖKvi ¸Y m¤¢e Avi Zv n‡jv µm ¸Yb| `ywU †f±‡ii gvb I G‡`i ga¨eZ©x †Kv‡Yi mvBb
Gi ¸Ydj‡K †f±i `ywUi µm ¸Yb e‡j| ‡f±i ¸Yb n‡jv GKwU †f±i ivwk hv †f±i `ywU †h mg‡Zv‡j Aew¯’Z
Zvi mv‡_ j¤^fv‡e Ae¯’vb Ki‡e|

Dc‡ii I †f±i؇qi µm¸Yb × ClassWiz K¨vjKz‡jU‡i mvaviY ¸YwPý (O) e¨envi K‡i mivmwi
Kiv hvq hv wb‡P †`Lv‡bv n‡jv-

WU ¸Yb wewbgq m~Î †g‡b P‡j wKš‘ µm ¸Yb wewbgq m~Î †g‡b P‡j bv| wb‡Pi w¯Œb n‡Z †`Lv hv‡”Q †h hw`

†f±i؇qi µm cwieZ©b Kiv nq Zvn‡j cÖvß djvdj c~‡e©i djvd‡ji wecixZ n‡e|

D`vniYgvjv

⃗⃗⃗⃗⃗⃗
1. g~jwe›`y 0 Gi mv‡c‡ÿ `yBwU we›`yi ¯’vbvsK (2, −1, 7), (−4,5, 0) n‡j | | wbY©q Ki‡Z n‡e|
mgvavb- w5†P‡c vector mode wbe©vPb K‡i †f±i‡K cÖ‡ek Kiv‡Z n‡e| Gici T evUb Pvcvi

ci 1 †P‡c Define Vector wbe©vPb Ki‡Z n‡e| Gici 2 †P‡c ‡f±i‡K cÖ‡ek Kiv‡Z n‡e| Avevi
T Pvcvi ci 4 ‡P‡c †f±i Ges p Pvcvi ci T3 †P‡c †f±i‡K wb‡Pi cÖ_g w¯Œ‡bi g‡Zv
⃗⃗⃗⃗⃗⃗
UvBc Ki‡Z n‡e| Gici = Pvc‡j †f±i cvIqv hv‡e| AZtci q((e) Pvc‡Z n‡e|
⃗⃗⃗⃗⃗⃗
me‡k‡l= Pvc‡j Vct Ans K¨vjKz‡jU‡i cÖ`wk©Z n‡e Ges =Pvc‡j †f±‡ii gvb cvIqv hv‡e|

(Key log- w5132=p1=7=T123p4=5=
0=CT4pT3=q(TR1)=)

̂
̂
2. = 2 ̂ + 2 ̂ + Ges = 2 ̂ + 10 ̂ − 11 Gi ga¨eZ©x †KvY wbY©q Ki‡Z n‡e|
mgvavb- w5 ‡P‡c vector mode wbe©vPb Kivi ci I †f±i‡K cÖ‡ek Kiv‡Z n‡e| Gici T

evUb Pvcvi ci R †P‡c wØZxq w¯Œ‡b wM‡q Angle wbe©vPb Ki‡Z n‡e| Avevi T †P‡c Vector A I Zvici
Kgv (q)) w`‡q Vector B cÖ‡ek Kwi‡q =Pvc‡j I †f±‡ii ga¨eZ©x †KvY cvIqv hv‡e|

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