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Vectors
sparsh arora
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Joined: 10 Jun 2011
Post: 3
10 Jun 2011 16:13:40 IST
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given P=A + B and Q= A-B ..if the magnitude of P & Q are equal ..whats the angle b/w these vectors..
Engineering Entrance , JEE Main , JEE Main & Advanced , Mathematics , Vectors

given P=A + B and Q= A-B ..if the magnitude of P & Q are equal ..whats the angle b/w these vectors..?


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Juhi Sharma
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Joined: 22 May 2009
Posts: 2467
13 May 2012 01:15:31 IST
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 pi/2 between a and b

a^2+b^2+2abcos@=a^2+b^2-2abcos@

cos@=0

@=pi/2
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RIYA JUMNANI
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Joined: 13 May 2012
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13 May 2012 10:07:30 IST
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same solution
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batra
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Joined: 1 Sep 2011
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21 Jun 2012 08:51:34 IST
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yes the answer to this is 90 degrees or pi /2 radians
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vik
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Joined: 30 Jun 2012
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30 Jun 2012 21:45:04 IST
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the answer is 90 only if magnitude of a,b not equal to 0
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