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Questions  

Electric charges of +10μC,+5μC,3μC and +8μC are placed at the corners of a square of side 2 m. the potential at the centre of the square is 

a
1.8 V
b
1.8×106 V
c
1.8×105 V
d
1.8×104 V

detailed solution

Correct option is C

Length of each side of square is 2 m so distance of it’s centre from each corner is 22=1m.Potential at the centre V=9×10910 ×10−61+5×10−61−3×10−61+8×10−61=1.8×105V

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