A physics lab instructor is working on a new demonstration. She attaches two identical conducting spheres with mass m = 0.190 g to cords of length Las shown in the figure. There are two strings in the figure. The top of each string is connected to the ceiling, and both strings are connected at the same point. The bottom of each string is connected to a spherical mass labeled m. Both strings have length Land hang at an angle of θto the vertical, with the two strings on opposite sides of the vertical. Both spheres have the same charge of 8.00 nC, and are in static equilibrium when θ = 5.45°. What is L (in m)? Assume the cords are massless. m (b) What If? The charge on both spheres is increased until each cord makes an angle of θ = 10.9° with the vertical. If both spheres have the same electric charge, what is the charge (in nC) on each sphere in this case? nC

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Ferromagnetism

Ferromagnetism is a mechanism by which some materials show magnetic properties. Iron and magnetite, an oxide of iron, are two naturally occurring materials that show the property of ferromagnetism. The word ferromagnetism is derived from the Latin name of iron, "Ferrum" as it was the first observed material to show such property. The property of ferromagnetism is shown by only a few substances such as iron, nickel, cobalt, and their alloys. Some transition metals and alloys of rare-earth metals also show ferromagnetism.