equipotential lines and electric field?

Physics
Tutor: None Selected Time limit: 1 Day

Determine the magnitude of the electric field at point 2 in the figure. 

I believe the correct formula is E = V / r . Having trouble determining values. The boxes are 1 cm apart. 

Thanls.

Feb 20th, 2015

The boxes are not visible. Please repost your question.

Feb 20th, 2015

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