Electric field lines

Question

An electric line of force in the XY plane is given by equation ${\mathrm{x}}^{2}+{\mathrm{y}}^{2}=1$. A particle with unit positive charge, initially at rest at the point x = 1 and y = 0 in the XY plane

Easy

Solution

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

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