lecture 21

lecture 21 - Problem 1 Derive an expression for the self...

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Unformatted text preview: Problem 1 Derive an expression for the self inductance of a solenoid that has a turns density n, crosssectional area A, and length l. Problem 2 You would like to construct a 50.0mH inductor by wrapping insulated copper wire (diameter = 0.0332 cm) around a tube with a circular crosssection of radius 2.67 cm. What length of wire is required, if it is wrapped onto the tube in a single, closepacked g q , pp g , p layer? Problem 3 A stepdown transformer produces a voltage of 6.0 V across the secondary coil when the voltage across the primary is 120 V. What voltage is driving the primary coil, if 120 V is produced across the secondary? p y Problem 4 A tiny bulb is emitting light uniformly in all directions. At a distance of 2.5 m from the source, the electric field has a maximum value of 26.9 N/C. Assuming that the light does not reflect from anything in the environment, calculate the average power of g y g , g p the light emitted by the source. ...
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