# Electromagnetic Field in Empty Space

Gold Member
Our Professor said there will be still an electric field in empty space even without charges.Hows that possible.Space-time has a some quantum property that acts like this ?

mfb
Mentor
If there are no charges at all in the whole universe, there won't be an electric field. But there are charges in the universe. You have an electric field even in regions without charges due to charges elsewhere.

Gold Member
I know but he meant something else ..

Gold Member
If there are no charges at all in the whole universe, there won't be an electric field. But there are charges in the universe. You have an electric field even in regions without charges due to charges elsewhere.
He said aomething like this.Theres electric fields or some field and ıf charge comes there like a postive one It disturbs the field.And makes our normal things it was something like that I dont quite remember

Dale
Mentor
2020 Award
You may have misunderstood your instructor. I would ask him or her for clarification directly.

Gold Member
You may have misunderstood your instructor. I would ask him or her for clarification directly.

Ok I will

mfb
Mentor
Well, technically "the electric field" is defined everywhere in space even without charges. Its strength is zero in that case. Usually this is called "no field", although mathematically the field is there.

Gold Member
Well, technically "the electric field" is defined everywhere in space even without charges. Its strength is zero in that case. Usually this is called "no field", although mathematically the field is there.
Make sense then...So ıf theres no charge in space-time its just there but "mathematically"
If we put a charge in space time charge makes a electric field so it become "real" ?

mfb
Mentor
If we have charges somewhere, the value of the field becomes non-zero.

A field that is zero everywhere doesn't do anything, at least in classical physics.

Arman777
Gold Member
If we have charges somewhere, the value of the field becomes non-zero.

A field that is zero everywhere doesn't do anything, at least in classical physics.

I see..Thanks

Baluncore