Three identical coils $\mathrm{A}, \mathrm{B}$ and C are placed co-axially as shown. Coils A and c c

Question

Three identical coils $\mathrm{A}, \mathrm{B}$ and C are placed co-axially as shown. Coils A and c carry equal currents in the direction shown. If coils $A$ and $C$ are fixed and $B$ moves towards $A$ with uniform speed then, in coil $B$, there is\

Professor PC Thomas Classes · Answer

A & C are fixed. B is moved towards A. The flux produced by A and passing through B will change. This will produce an emf in $B$ which will set up a current which opposes $B$ moving towards $A$. For this the current in B must be opposite to the current in A ie current in B is anticlockwise.