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  1. D

    Four Charged Particles in a Square

    Homework Statement In the figure below, four particles form a square. The charges are q1 = +Q, q2 = q3 = q, and q4 = -5.25Q. What is q/Q if the net electrostatic force on particle 1 is zero? Homework Equations F=k|q1||q2|/r2 a2+b2=c2 The Attempt at a Solution I first drew a free...
  2. D

    Circular Interference, Newton's Rings

    Homework Statement The figure below shows a lens with radius of curvature R lying on a flat glass plate and illuminated from above by light with wavelength λ. This photo, taken from above the lens, shows that circular interference fringes (called "Newton's rings") appear, associated with the...