Electric Charges And Fields

Charge will move along the circular line of force because \$x^{2} + y^{2} = 1\$ is the equation of circle in \$xy - plane\$.

Question

An electric line of force in the $x y - p l a n e$ is given by equation $x^{2} + y^{2} = 1$ . A particle with unit positive charge, initially at rest at the point $x = 1, y = 0$ in the $x y - p l a n e$ .