Teaching DSSSB TGT Mock Test 2025 Electromagnetic Theory Vector Calculus Curvilinear Coordinates

बिंदु A(x = 2, y = 3, z = -1) और B(r = 4, θ = 30°, ϕ = 120°) दिया गया है। तो A और B के बीच की दूरी ज्ञात कीजिए। 

1
7.26
2
4.10
3
6.12
4
5.53
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