Electromagnet -- changing flux and a ring

[Jahnavi]

Homework Statement

Homework Equations

The Attempt at a Solution

If an observer stands between A and B then he/she sees current flowing in clockwise direction in A .Now if current in A increases , flux linked with B also increases .From lenz law current should flow in clockwise direction (from observer's view ) .Thus A and B should repel each other .

Option 3) should be right .

Is that correct ?

 

[Charles Link]

That is correct. $\\$ One thing you need to assume here is that current loops that have their currents going in the same direction attract each other because of the result of their magnetic fields, and current loops with their currents in the opposite direction will repel. $\\$ A cylindrical magnet with its + (north pole) in the upward direction has its currents that cause the magnetism going in the counterclockwise direction. Another cylindrical magnet aligned with it, (placed above or below it), will be attracted to it. The $+$ pole in the top end of one will be attracted to the $-$ pole on the bottom of the other, with both of them having their currents from the magnetism going counterclockwise.

 

[Jahnavi]

Thanks

 

[Jahnavi]

current loops that have their currents going in the same direction attract each other because of the result of their magnetic fields, and current loops with their currents in the opposite direction will repel.

Yes . I think it is less confusing if we place the observer such that both the loops are on the same side ( not the way I did in the OP ) , either both to the left or both to the right . I placed the observer in between A and B such that to the observer , both the current loops have clock wise current and repel each other .