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a circular component of current flows as well, due to Lorentz force. Initial interest in this problem began with Boltzmann in 1886, and independently was re-examined by Corbino in 1911.

In a simple model, supposing the response to the Lorentz force is the same as for an electric field, the carrier velocity is given by:

where is the carrier mobility. Solving for the velocity, we find:

where the effective

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