Two point charges $q$ and $- 2 q$ are kept $^{'} d^{'}$ distance apart. Find the location of the point relative to charge $q$ at which potential due to the system of charges is zero.

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Solution

Now at all points on the line $A B$ the resultant field is always parallel to the line joining the two charges $i . e ., A B$
So there can be infinite number of points where the resultant field is parallel to the line joining that two charges $.$

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Two point charges q and −2q are kept ′d′ distance apart. Find the location of the point relative to charge q at which potential due to the system of charges is zero.

Now at all points on the line AB the resultant field is always parallel to the line joining the two charges i.e.,AB So there can be infinite number of points where the resultant field is parallel to the line joining that two charges.

Two point charges $q$ and $- 2 q$ are kept $^{'} d^{'}$ distance apart. Find the location of the point relative to charge $q$ at which potential due to the system of charges is zero.

Now at all points on the line $A B$ the resultant field is always parallel to the line joining the two charges $i . e ., A B$
So there can be infinite number of points where the resultant field is parallel to the line joining that two charges $.$