A) \[+\,2\vec{A},0\]
B) \[+\,\vec{A},0\]
C) \[-\,\vec{A},0\]
D) \[-2\,\vec{A},0\]
Correct Answer: D
Solution :
Key Idea: When direction of a vector is reversed it has same magnitude but -with minus sign. The value of \[\Delta \vec{A}={{\vec{A}}_{2}}-{{\vec{A}}_{1}}\] Given, \[{{\vec{A}}_{1}}=,A,{{\vec{A}}_{2}}=-A\] \[\therefore \] \[\Delta \,\vec{A}=-A-A=-2\,\vec{A}\] Also, \[|\vec{A}|=|-\vec{A}|\] \[\therefore \] \[\Delta |\vec{A}|=0\]You need to login to perform this action.
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