A steel bar 1 m long and 0.20 cm in radius is rigidly attached at one end. Attached to the other end is a 20-cm-radius disk that is free to rotate. Suspending a 500-g weight from a cord wrapped around the disc, the load is observed to drop 10 cm. a) What is the modulus of rigidity of the material of which the bar is made? b) What is the decrease in potential energy of the charge? c) What is the elastic potential energy of the bar subjected to torsion?

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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.