Three equal and similar charges are placed at `(–a, 0, 0), (0, 0, 0)` and `(+a, 0, 0)`. What is the nature of equilibrium of the charge at the origin-

Three equal and similar charges are placed at (-a, 0, 0), (0, 0, 0) and (+ a, 0, 0). Whais the nature of equilibrium of the charge at the origin ?

Four equal point charges Q each are placed in the xy plane at (0,2), (4,2), (4,-2) and (0, -2) . The work required to put a fifth charge Q at the origin of the coordinate system will be

Four equal point charges Q each are placed in the xy plane at (0,2), (4,2), (4,-2) and (0, -2) . The work required to put a fifth charge Q at the origin of the coordinate system will be

Four identical charges are placed at the points (1,0,0), (0,1,0),(-1,0,0) , and (0,-1,0) . Then,

Four identical charges are placed at the points (1,0,0), (0,1,0),(-1,0,0) , and (0,-1,0) . Then,

Three point charge q_1=1muC, q_2=-2muC and q_3=3muC are placed at (1m, 0,0), (0,2m,0) and (0,0,3m) respectively. Find the electric potential at as origin.

Three point charge q_1=1muC, q_2=-2muC and q_3=3muC are placed at (1m, 0,0), (0,2m,0) and (0,0,3m) respectively. Find the electric potential at as origin.

Four charges +q,+q-q, and -q are placed on X - Y plane at the points whose coordinates are (0.5, 0), (0, 0.5), (-0.5, 0) and (0, -0.5) respectively. The electric field due to these charges at a point P(r,r), where r gtgt 0. 5 , will be