what is circular coil?
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It means that when the current flows in a circular wire (coil), the magnetic field produced has straight lines of force near the centre of the coil, as shown in figure. The parallel lines are in a plane perpendicular to the plane of the coil.
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Iron filing can be scattered on the clear surface which passes through the coil and when a current then flows around the coil, the magnetic lines of a force will be shown by the alignment of the filing, the apparatus can also be used in conjunction with a magnetic field sensor and / or datalogger.
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