# Induced current in a solenoid

## 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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TSny
Homework Helper
Gold Member
I agree with you. Part c is similar to part a.

Clara Chung
cnh1995
Homework Helper
Gold Member
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.

Clara Chung