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Chapter 30: Q. 10 (page 869)
10. An inductor with a current stores energy. At what current will the stored energy be twice as large?
The stored energy will be twice the initial store energy at 2.8 A current.
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Equation 30.26 is an expression for the induced electric field CALC inside a solenoid . Find an expression for the induced electric field outside a solenoid in which the magnetic field is changing at the rate .
What is the direction of the induced current in FIGURE Q
What is the potential difference across a 10 mH inductor if the current through the inductor drops from 150 mA to 50 mA in 10 ms? What is the direction of this potential difference? That is, does the potential increase or decrease along the direction of the current?
Experiments to study vision often need to track the movements BI0 of a subject's eye. One way of doing so is to have the subject sit in a magnetic field while wearing special contact lenses with a coil of very fine wire circling the edge. A current is induced in the coil each time the subject rotates his eye. Consider the experiment of FIGURE P30.60 in which a 20 -turn, 6.0-mm-diameter coil of wire circles the subject's cornea while a 1.0 T magnetic field is directed as shown. The subject begins by looking straight ahead. What is induced in the coil if the subject shifts his gaze by
The rectangular loop in FIGURE has resistance. What is the induced current in the loop at this instant?
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