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Unformatted text preview: Solution for Lab Quiz 21 Inductance Solution to Lab Quiz Problem 21.1(Current Needed to Double the Energy Stored by an Inductor) Problem: When a current I flows through a given in- ductor, the inductor can store an energy U . For the same inductor to store an energy of 2 U , what would the current in the inductor need to be? Select One of the Following: (a) The current needed is 4 I . (b) The current needed is 2 I . (c-Answer) The current needed is 2 I . (d) The current needed is I/ 2 . Solution The energy U stored by an inductor with inductance L and current I is equal to U = 1 2 LI 2 . For a given L , if the current is increased from I to 2 I , the energy stored is doubled. Total Points for Problem: 3 Points Solution to Lab Quiz Problem 21.2(How to Make emf in Conducting Hoop) Problem: A conducting hula-hoop lies on the ground in the Earths magnetic field. Assume the field is constant....
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