The electric charges on the two metal plates shown above create a uniform electr

Question

The electric charges on the two metal plates shown above create a uniform electric field E between

the plates. Now we place a negatively charged ball (-q) at the midpoint between these plates. This will

create a distortion of the field lines. For the three positions shown (A, B, C), rank the magnitude of

the electric field in order from strongest to weakest.

Please explain what theory is used as well as answering it. :)

The electric charges on the two metal plates shown above create a uniform electric field E between the plates. Now we place a negatively charged ball (-q) at the midpoint between these plates. This will create a distortion of the field lines. For the three positions shown (A, B, C), rank the magnitude of the electric field in order from strongest to weakest. Please explain what theory is used as well as answering it. :)

Explanation / Answer

EC > EA > EB


negative charge always produces electric field radially inward

let E is the electric filed in between plates
and E' is the electric field due to negative charge

Ec = E+E'
EA = E
EB = E - E'

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