Electric Potential at a Point in Space Due to a Point Charge Q
Two point cha...
Question
Two point charges 4μC and 9μCare separated by a distance of 50 cm. The potential at the point between them where the field has zero strength is
A
4.5×105V
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B
9×105V
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C
9×104V
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D
Zero
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Solution
The correct option is A4.5×105V Assume the point at which field is zero is at a distance X from 4μC X=d√q2q1+1=50√94+1=5032+1=1005=20cmV=V1+V2=14πϵ0[q1r1+q2r2]=9×109[4×10−60.2+9×10−60.3]=9×103[20+30]=9×103×50=4.5×105V