It is written that plane of laminations should be arranged parallel to magnetic field. Plz show a diagram. In the book, no diagram is there for this

Dear Student,
Thank you for sharing your query with us. Below is the solution to your query:

We know that in transformers in order to reduce induced eddy currents, the core is split into thin sheets of steel, each lamination being insulated from others by a thin layer of varnish.
Since the laminations are thin, they will have high resistance.

The planes of these sheets are placed perpendicular to the direction of the current that would be set up by the induced emf. 
The planes of these sheets are arranged parallel to the magnetic fields so that they can cut across the eddy current paths.

Large resistances between the sheets confines the eddy currents to the thin sheets. Each lamination sheet will have an eddy current circulates within it. Tiny eddy currents still exist, but only within each thin sheet, so are greatly reduced.

Below is a diagram for your reference:


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Team Meritnation