To protect a material from the influnce of an external magnetic field, the materials should be kept
A
square steel ring
B
triangular zinc ring
C
soft iron ring
D
loop of copper wire
Verified Correct Answer: C.
Physical Principles & Numerical Solution
In order to protect a material from the influence of an external magnetic field, the material is placed in a soft iron ring, usually referred to as magnetic screening.
Source: Myschool Past Questions Archive (Record #12806)