NIMCET 2011 Question Paper with solutions

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Question : 11 of 120

Marks: +1, -0

If

θ

is the angle between

{a}

and

b

and

|a × b|=|a ⋅ b|

, then

θ

is equal to

0
π
π/2
π/4

Solution:

Given,

|a × b|=|a ⋅ b|

{|a|}|b|{|\sin θ|}={|a||b|}{|\cos θ|}

⇒ { |\tan θ|}=1 ⇒ θ=\;{π}/{4}

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