Induced current in a solenoid

  • #1
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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
 

Answers and Replies

  • #2
TSny
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I agree with you. Part c is similar to part a.
 
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  • #3
cnh1995
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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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