Consider a particle, having a charge +q, lying, at rest, on a frictionless, hori

Question

Consider a particle, having a charge +q, lying, at rest, on a frictionless, horizontal, table that is connected to a string of length d. The other end of the sting is held to a pivot at the origin so that the string makes an initial angle of theta with the x-axis. An external uniform electric field of magnitude E is applied in the direction of the positive x-axis. The particle is released from rest at time t=0. Find an expression for the speed of the particle when the string lies parallel to the electric field. Assume that both the table and the string are electrically insulated.

Explanation / Answer

speed = [2Eqd(1 - costheta)/m]^(1/2)

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