The charges are placed at corners of a square. Let the electric field and electric potential at its centre be \(\vec E\) and V respectively. If the charges at A and B are displaced with respect to the charges at C and D, then:
(a) V changes and \(\vec E\) remains unchanged
(b) Both \(\vec E\) and V changes
(c) Both \(\vec E\) and V remains unchanged
(d) 
changes and V remains unchanged
