Why Does Induced Current in a Solenoid Flow Left to Right?

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SUMMARY

The discussion centers on the direction of induced current in a solenoid, specifically addressing a scenario where the current flows from left to right through an ammeter. The participants reference Ohm's Law (I=V/R) to explain that a decrease in resistance (R) leads to an increase in current through solenoid X. They also cite the relationship between current and magnetic flux density (B=unI) and apply Lenz's Law to determine that the induced current in solenoid Y flows in the opposite direction to counteract the change in magnetic field. The right-hand grip rule is used to confirm the direction of current flow.

PREREQUISITES
  • Understanding of Ohm's Law (I=V/R)
  • Familiarity with magnetic flux density (B=unI)
  • Knowledge of Lenz's Law and its application
  • Proficiency in using the right-hand grip rule for current direction
NEXT STEPS
  • Study the applications of Lenz's Law in electromagnetic induction
  • Explore the relationship between resistance and current in electrical circuits
  • Investigate the right-hand grip rule in various electromagnetic scenarios
  • Learn about solenoid design and its effects on induced currents
USEFUL FOR

Students of physics, educators teaching electromagnetism, and anyone interested in understanding the principles of induced current and magnetic fields in solenoids.

Clara Chung
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Homework Statement



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Homework Equations

The Attempt at a Solution


The answer of 2c is : Current through A to the left.
But I think it is to the right.
By I=V/R, a reduced resistance R results in an increase of current through solenoid X. By B=unI, an increase in current causes the magnetic flux density to increase(where field lines point right). By lenz's law there will be an induced current in solenoid Y to produce a magnetic field opposite to the increase of magnetic field in X, which points from right to left. By right hand grip rule the current flows from left to right through the ammeter.
Why am I wrong. Thanks
 
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I agree with you. Part c is similar to part a.
 
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Clara Chung said:
By I=V/R, a reduced resistance R results in an increase of current through solenoid X. By B=unI, an increase in current causes the magnetic flux density to increase(where field lines point right). By lenz's law there will be an induced current in solenoid Y to produce a magnetic field opposite to the increase of magnetic field in X, which points from right to left. By right hand grip rule the current flows from left to right through the ammeter.
Your reasoning sounds correct to me.
 
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