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The current in two medium A and B are due to the flow of electrons and ions respectively. Then the nature of A and B respectively are
1. solid, liquid
2. gas, liquid
3. solid, solid
4. liquid, gas

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Correct Answer - Option 1 : solid, liquid

The correct answer is option 1) i.e. solid, liquid


  • Electric current is defined as the amount of charge flowing per unit time. It is given by

\(I = \frac{q}{t}\)

Where I is current, q is the charge and t is the time.

  • Conduction in solids:
    • Atoms of conducting materials have free electrons in them.
    • ​When a potential difference is set up across a conducting wire, the electric field produced mobilizes the free electrons. This causes the movement of electrons and thus produces current.
  • Conduction in liquids:
    • An ionic compound dissolved in a liquid dissociates into the pair of negative and positive ions. 
    • When a voltage is applied across electrodes placed in the liquid, the ions present in it start moving.
    • The positive ions drift towards the cathode (negative electrode) and the negative ions drift towards the anode (positive electrode).
    • This movement of ions causes the conduction of current in liquids.


  • Conduction in solids is due to the flow of electrons. So, medium A is solid.
  • Conduction in liquids is due to the flow of ions. So, medium B is liquid.

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