WAEC - Physics (2010 - No. 45)

Eddy currents can be reduced by
using coil of high resistance
winding the coil on a soft iron core
creating holes in the metal plates
using coil of low resistance

Explanation

This method interrupts the flow of eddy currents by increasing the resistance in the path of the currents, thereby reducing their magnitude.

 Other Options:
A. Using a high-resistance coil: This does not directly affect eddy currents in conductive materials.
B. Winding the coil on a soft iron core can enhance magnetic effects and may not reduce eddy currents.
D. Using low resistance coil: This would not help reduce eddy currents; it could potentially increase the flow of currents.

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