1.

A vector bar(a) has components a_(1), a_(2), a_(3) in the right handed system OXYZ. If the coordinate system is rotated about z-axis through an angle pi//2, the component of bar(a) in the new system are

Answer»

`(a_(2), -a_(1), a_(3))`
`(a_(2), a_(1), a_(3))`
`(-a_(2), a_(1), a_(3))`
`(-a_(2), -a_(1), a_(3))`

ANSWER :A


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