Find the potential difference between A and B

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Fatima Hasan
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Homework Statement


screenshot_31.png


Homework Equations


V = kq / r

The Attempt at a Solution


VA = k q / rA
VB = k q / rB
rB = √((√8 * R)2 + R2)
= 3 R
VB = k q / 3R
ΔV = | VA - VB |
= | kq / R - Kq / 3R |
= 2 kq / 3 R
Can somebody check my answer please ?
 

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