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Q.

Given that a→,b→,p→,q→ are four vectors such that a→+b→=μp→,b→⋅q→=0 and (b→)2=1 where μ is a scalar. Then |(a→⋅q→)p→−(p→⋅q→)a→|is equal to

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a

2|p→⋅q→|

b

(1/2)|p→⋅q→|

c

|p→×q→|

d

|p→.q→|

answer is D.

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Detailed Solution

a→+b→    =μp→ b→⋅q→=0,|b→|2=1∵    a→+b→=μp→⇒    (a→+b→)×a→=μp→×a→,b→×a→=μp→×a→⇒    q→×(b→×a→)=μq→×(p→×a→)⇒    (q→⋅a→)b→−(q→⋅b→)a→=μq→×(p→×a→)⇒    (q→⋅a→)b→=μq→×(p→×a→)∵    a→+b→=μp→⇒    q→⋅(a→+b→)=μq→⋅p→⇒    q→⋅a→+q→⋅b→=μp→⋅q→⇒    μ=q→⋅a→p→⋅q→⇒     (q→⋅a→)b→=q→⋅a→p→⋅q→[(q→⋅a→)⋅p→−(q→⋅p→)a→]⇒     |(q→⋅a→)p→−(q→⋅p→)a→|    =|(p→⋅q→)b→|=|(p→⋅q→)|⋅|b→|⇒    |(q→⋅a→)p→−(q→⋅p→)a→|=|p→⋅q→|
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Given that a→,b→,p→,q→ are four vectors such that a→+b→=μp→,b→⋅q→=0 and (b→)2=1 where μ is a scalar. Then |(a→⋅q→)p→−(p→⋅q→)a→|is equal to