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3. Using Biot-Savart's law determine the magnetic field at the point on the axis of the Helmholtz coil. Remember that Helmholtz coils by definition

3. Using Biot-Savart's law determine the magnetic field at the point on the axis of the Helmholtz coil. Remember that Helmholtz coils by definition consists of two coils of same radius and separated by a distance so chosen to make the second derivative of B vanish at the centre of the axis between the coils.

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