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Aman Sagar Grade: 11
        

Q. If vector A=i+j and vector B=i-k, the angle between vector A and B is


A)zero B)180degree C)60degree D)90degree

7 years ago

Answers : (2)

Pavan kumar
18 Points
										

|A| = |B| = 2^1/2


A.B = 1


Hence angle between A and B is cos-1(A.B/(|A||B|)) = cos-1(1/2) = 60 degrees.

7 years ago
pavan shete
18 Points
										DEAR,

A=(1,1,0) MAGNITUDE OF A =[A]=SQRT(2);
B=(1,0,-1) ;[B]=SQRT(2); A.B=(1*1)+(1*0)+(0*-1)=1
A.B=[A][B]COS(THETA);
1=2*COS(THETA);
COS(THETA)=1/2;
HENCE THETA =60 DEGREES;
OPTION C IS ANSWER.
7 years ago
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