Question

plz answer quick????????????​

Answer 1

Good Morning!!

r = xi + yj + zk

∆ . r =

{di/dx + dj/dy + dk/dz } . { xi + yj + zk }

∆ . r = { dx/dx + dy/dy + dz/dz }

∆ . r = 1 + 1 + 1

∆ .r = 3

Where ∆ is del operator. and r is any vector.