Physics
Grade-10
Easy
Question
Two identical coaxial circular loops carry a current “I” each, circulating in the same direction. If the loops approach each other, what will you observe?
- The current in each increase
- The current in each decrease
- The current in each remains the same
- The current in one increases whereas that in the other decreases
Hint:
The current in each loop will decrease as the flux rises in order to offset the rising flux.
The correct answer is: The current in each decrease
When the two coaxial loops are circulating in the same direction and the loops approach each other the current in each decreases.
- The induced current will be more when the loops arranged one after the other is directed in the same direction.
- The overall flux connection grows as the two are positioned closer together.
- By virtue of Lenz's law, a current will be generated in each loop that opposes the flux change.
- Thus, in the coaxial loops, they are directed in an anti-clockwise direction as the loops approach each other.
- As a result, the net current in each loop will decrease as the flux rises in order to offset the rising flux.
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