A wire has a non-uniform cross-section as shown. A steady current is flowing through it. Then the current density
is constant throughout the wire
decreases from A to B
increases from A to B
varies randomly
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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