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23 Nov 2019
Two equal positive point charges +q are on the y axis; one isat y = +a and the other is at y = -a. The electric field at theorigin is zero, A test charge q_0 placed atht e origin willtherefore be in equilibrium. a) Discuss the stability of the equilibrium for a positivetest charge by considering small displacements from equilibriumalong the x axis and small displacements along the y axis. b) Repeat part (a) for a negative test charge. c) Find the magnitude and sign of a charge q_0 that whenplaced at the origin results in a net force of zero on each of thethree charges.
Two equal positive point charges +q are on the y axis; one isat y = +a and the other is at y = -a. The electric field at theorigin is zero, A test charge q_0 placed atht e origin willtherefore be in equilibrium.
a) Discuss the stability of the equilibrium for a positivetest charge by considering small displacements from equilibriumalong the x axis and small displacements along the y axis.
b) Repeat part (a) for a negative test charge.
c) Find the magnitude and sign of a charge q_0 that whenplaced at the origin results in a net force of zero on each of thethree charges.
Jean KeelingLv2
20 Jan 2019
