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Steady Electric Currents

  1. A disc of thickness 't' has radius 'b' and conductivity of the disc material is 'a' . A central hole of radius is drilled.By what percentage the resistance between the two flat sides of the disv changes? What is the resistance between the hole and the rim of the disc.


    2. Solution :

    Let R represent the resistance of the disc and be the resistance of the disc with the hole.

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