Charges are placed on the vertices of a square as shown. Let \vec{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 espectively, then

  • Option 1)

    \vec{E}changes,V remains unchanged

  • Option 2)

    \vec{E} remains unchanged V changes

  • Option 3)

    both \vec{E} and V change

  • Option 4)

    both \vec{E} and V unchanged

 

Answers (2)

As we learnt in

Direction of Electric field -

Due to Positive Charge electric field is always away from the charge.

-

 

 

Direction of Electric field -

 

Due to Negative charge electric field is always towards the charge.

-

 

 "Unit positive charge" will be repelled by  A and B and attracted by -q and -q downwards in the same direction. If they are exchanged the direction of the field will be opposite. In the case of potential, as it is a scalar, they cancel each other whatever may be their position.

 

\therefore  Field is affected but not the potential.


Option 1)

\vec{E}changes,V remains unchanged

Correct

Option 2)

\vec{E} remains unchanged V changes

Incorrect

Option 3)

both \vec{E} and V change

Incorrect

Option 4)

both \vec{E} and V unchanged

Incorrect

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