# Physics: Derivations, Proofs and Experiments

Do not you think that a math formula is right or do you doubt any statement of a theory? Here you can eliminate your scientific doubt by formal reasoning (mathematical proofs, derivations) or empirical reasoning (experiments, studies).
Derivation
Level 3 (with higher mathematics)

## Total (Equivalent) Inductance of a Series and Parallel Circuit of Coils

Derivation of the total inductance (equivalent inductance) of a parallel circuit and series circuit of two coils using the Faraday's law of induction.

Derivation
Level 4 (for physics pros)

## Magnetic Field of a Helmholtz Coil

Derivation of the homogeneous magnetic field in the center (on the symmetry axis) of the Helmholtz coil with radius R and distance d.

Derivation
Level 3 (with higher mathematics)

## Hall Voltage due to the Hall Effect

Derivation of the Hall voltage (via Hall effect), which depends only on quantities that we can easily determine in an experiment.