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## Main Question or Discussion Point

I have that ∇

Why is it that ∅ must be a constant?

I'm trying to understand magnetic field

any help?

^{2}∅ = 0 everywhere. ∅ is a scalar potential and must be finite everywhere.Why is it that ∅ must be a constant?

I'm trying to understand magnetic field

**B**in terms of the Debye potentials:**B**=**L**ψ+**L**χ+∇∅. I get this from C.G.Gray, Am. J. Phys. 46 (1978) page 169. Here they found that**L**χ=0 and ∇∅=0 and therefore gives no contribution to**B**.any help?