Q R R Ꮎ x Consider three positive charges Q placed on an arc of a circle that is centered at the origin. Q What is the correct expression for x component of the electric field at the origin? Ex ○ Ex ○ Ex Ex - = = = kyQ R² kgQ k₁Q kip Q R² ² (1 2 1+ (sin 0)² (1 + 2 cos 0) (1 + 2 sin 0) 1+ 2 (cas )²