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Grade: 12th pass
        Let a be the position vector of a given point (x1, y1, z1), and r the position vector of any point (x, y, z). Describe the locus of r if (a) I r - a I = 3, (b) (r-a). a = 0, (c) (r-a).r = 0.
2 years ago

Answers : (2)

Vikas TU
11138 Points
							
Dear student 
Question is not clear 
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4 months ago
Aditya Gupta
2014 Points
							
(a) | r - a | = 3 is a sphere with centre (x1, y1, z1) and radius 3.
(b) (r-a). a = 0 is a plane passing through (x1, y1, z1) with normal a.
(c) (r-a).r = 0 is a sphere with centre (x1/2, y1/2, z1/2) and radius |a|/2.
2 months ago
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