Two positive equal charges are placed symmetrically about the origin on the x -axis and kept fixed as shown. Another positive charge Q is placed at the origin. The charge Q can be displaced by a very small distance to P₁ along the x -axis or to P₂ along the y -axis. Then,

Options

1. Ato the lowest order, the force on Q at P₂ is proportional to .
2. Bto the lowest order, the force on Q at P₁ is proportional to ^2 .
3. Cthe charge Q is in stable equilibrium with respect to small displacements along y -axis.
4. Dthe charge Q is in stable equilibrium with respect to small displacements along the x -axis.