Question

what is charge defination in physics

Answer 1

Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. 

Answer 2

Physics is the act of matching a computer program output to a natural system, so that aspects of the physical system are matched by the computer program.

Any predictive program works, but the fundamental physics is ambitious, in that it wishes to be able to match a computer program to any concievable situation, so that it can reproduce the results of the situation as best possible.

Where charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field.