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A wire has a non-uniform cross-section as shown. A steady current is flowing through it. Then the current density

  • Option 1)

     is constant throughout the wire

  • Option 2)

    decreases from A to B

  • Option 3)

    increases from A to B

  • Option 4)

    varies randomly

 

Answers (1)

best_answer

As we learnt

 

Current density -

 

The amount of electric current flowing per unit cross-sectional area of material.

- wherein

 

 

 

Current density is J= I/A

I is constant and Area is increasing as we move from A to B. Hence Current density J will decrease as we move from A to B.


Option 1)

 is constant throughout the wire

Option 2)

decreases from A to B

Option 3)

increases from A to B

Option 4)

varies randomly

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Plabita

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