Describe with the aid of a diagram, an absolute method of determining resistance

Describe with the aid of a diagram, an absolute method of determining resistance

The circuit is connected as above.

The metal disc of known radius r, is placed at the center of solenoid carrying current with the plane of the disc perpendicular to magnetic field.

The disc is rotated using the driving shaft.

The speed of rotation of the disc is adjusted until the galvanometer shows no deflection. The number of revolutions for a given interval of time is counted and the frequency, f, determined.

The resistance is then calculated from;

R = μ₀nπr²f;

Where n is the number of turns per meter of the solenoid

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