The name is absent

The current density J through the cross section of the neuronal projection could
be calculated from:

Magnetic field in dendrites

The currents inside dendrites are experimentally measured to be from 20pA to
100pA for GABAergic synapses (Akaike & Moorhouse, 2003). Using the formula

(75)           <j) H ∙ dl = i

Γ

we can find the magnetic intensity for a contour Γ with length l=πd that
interweaves the whole current iA. For dendrite with d~1 μm we obtain:

If we consider that the water and the microtubules form a system augmenting the
magnetic strength known as ferrofluid (Frick et al., 2003) then in the best-case
with effective magnetic permeability μ_eff ≈ 10, where μ_eff = —, we will obtain
^μ0

the maximal magnitude of the magnetic induction B inside the neuronal
projection:

(77)       B = μ_α μ_α H

(78)         B=10×4π×10^-7H.m^-1×31.8×10^-6A.m^-1≈4×10^-10T

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