If bar(a),bar(b) and bar( c ) are three ...

If `bar(a),bar(b)` and `bar( c )` are three vectors such that `bar(a)+bar(b)+bar( c )=bar(0)` and `|bar(a)|=2,|bar(b)|=3` and `|bar( c )|=5`, then the value of `bar(a).bar(b)+bar(b).bar( c )+bar( c ).bar(a)` is ………..

A

0

B

1

C

`-19`

D

38

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The correct Answer is:

C

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bar(a),bar(b) and bar( c ) are non zero vectors. |(bar(a)xx bar(b))*bar( c )|=|bar(a)||bar(b)||bar( c )| then ……………

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bar(a),bar(b) and bar( c ) are three unit vectors. bar(a)_|_bar(b) and bar(a)||bar( c ) then bar(a)xx(bar(b)xx bar( c )) = …………….

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For vectors bar(a),bar(b),bar( c ),|bar(a)-bar( c )|=|bar(b)-bar( c )| then the value (bar(b)-bar(a)).(bar( c )-(bar(a)+bar(b))/(2))= ………..

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