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If A=2i+3j-4k and B=6i-j+5k then A·b=?
(A) –7
(B) 7
(C) –11
(D) 11
The answer is: (C) –11
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When a force F=4i+6j is applied to an object, it undergoes a displacement of d=2i+4j. What is the work done?
The SI unit of current is