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the concentric circle shows the magnetic field around this conductor, increases when we go far away from it.
tanu9798:
write its defination also
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Current passing through current carrying conductor produces magnetic effect. Magnetic field of current carrying conductor is perpendicular to current .
These concentric circles are for due to magnetic effect of current carrying conductor.
In this given figure ammeter is connect to circuit to take current readings and variable resistance is connected to varry the resistance
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