The magnetic needle deflects maximum when the liquid used is:

  • Distilled water
  • Drinking water
  • Sea water
  • It will not show any deflection

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The correct option is: C Sea water


Sea water contains a significant amount of dissolved salts, which increases the conductivity of the liquid. This, in turn, enhances the magnitude of current flowing through the circuit. As a result, the magnetic needle experiences greater deflection when sea water is used.

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