Most scientists believe that it is caused by an abnormal protein in brain tissue, called a prion, that can cause fatal disease when eaten.
An alternating current passes through the primary coil. The alternating current produces a magnetic field that continuously changes direction. The soft iron core increases the strength of the magnetic field.So the transforemer is made of soft iron core.
Retentivity of soft iron is greater than retentivity of steel
soft iron is more magnetised than steel loses its magnetism more rapidly than steel
You can use the points of answer:
B and F