Question

An electric line of force in the $xy$ plane 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 $xy$ plane

• A. not move at all
• B. will move along straight line
• C. will move along the circular line of force
• D. information is insufficient to draw any conclusion

Answer 1

Answer: (C)

will move along the circular line of force

Answer 2

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