Charges are placed on the vertices of a square as shown. Let $\to E$ be the electric field and V the potential at the centre. If the charges on A and B are interchanged with those on D and C respectively, then [AIEEE-2007]

Both

\to E

and V change

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\to E

and V remain unchanged

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\to E

changes, V remains unchanged

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\to E

remains unchanged, V changes

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Solution

The correct option is C $\to E$ changes, V remains unchanged
If charges are interchanged, the separation of charges remains unchanged from the centre of the square. Thus potential won't change as it is a scalar quantity.

Although the Electric field will now point in the opposite direction i.e., upwards without any change in its magnitude. Electric field is a vector quantity and points radially away from positive charges.

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Charges are placed on the vertices of a square as shown. Let →E be the electric field and V the potential at the centre. If the charges on A and B are interchanged with those on D and C respectively, then [AIEEE-2007]

Charges are placed on the vertices of a square as shown. Let $\to E$ be the electric field and V the potential at the centre. If the charges on A and B are interchanged with those on D and C respectively, then [AIEEE-2007]