What must occur within a magnetic material before it exhibts magnetic properties? a

The material must be of a specific size

b

The material must be charged with electricity

c

The magnetic domains inside the material must be aligned

d

The magnetic material must be created artificially

Option C, The magnetic domains inside the material must be aligned

Explanation:

Magnetic domains determine the magnetic behavior of any substance. Most of the magnetic substances have disoriented magnetic domains due to which they do not behave as magnets until unless an external force is applied to change the orientation of their domains and align them properly.

Hence, option C is correct

to treat tumors in the body

this is a good question! i'll do some research and come back when i have the answer!