Is My Calculation of Electric Field Correct Using the Paint Document?

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Miike012
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The question is in the paint doc...

What I did...

1st eq.
v = kq/r

q = vr/k

2nd equ.

E = kq/r^2

where am I going wrong...? For E I am getting 2500
 

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The potential is not linear function of the distance, it changes 25 V from the second circle to the third one, and 50 V from the third circle to the fourth. The electric field is negative potential gradient, -ΔV/Δd. Use both circles, below and above the point shown to get it.

ehild
 

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