(a) A physics lab instructor is working on a new demonstration. She attaches two identical iron spheres with mass m = 0.220 g to strings of length L as shown in the figure.   Both spheres have the same charge of 7.60 nC, and are in static equilibrium when θ = 4.50°. What is L (in m)? Assume the strings are massless. ??? m (b) What If? The charge on both spheres is increased until each string makes an angle of θ = 9.00° 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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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.