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PY208N-Lecture-23

PY208N-Lecture-23 - Physics 208N-004 Lecture#23 16 March...

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1 Review: 30-2 Self-Inductance Conceptual Example 30-4: Direction of emf in inductor. Current passes through a coil from left to right as shown. (a) If the current is increasing with time, in which direction is the induced emf? (b) If the current is decreasing in time, what then is the direction of the induced emf? Physics 208N-004 Lecture #23 – 16 March 2011 Chapter 30: 4 – Magnetic Energy, RL Circuits 30-2 Self-Inductance Example 30-5: Coaxial cable inductance. Determine the inductance per unit length of a coaxial cable whose inner conductor has a radius r 1 and the outer conductor has a radius r 2 . Assume the conductors are thin hollow tubes so there is no magnetic field within the inner conductor, and the magnetic field inside both thin conductors can be ignored. The conductors carry equal currents I in opposite directions.

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2 Just as we saw that energy can be stored in an electric field, energy can be stored in a magnetic field as well, in an inductor, for example. Analysis shows that the energy density of the field is given by 30-3 Energy Stored in a Magnetic Field We find the mutual inductance of the inner loop. If we assume the outer solenoid is carrying current then the magnetic field inside the outer solenoid is
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PY208N-Lecture-23 - Physics 208N-004 Lecture#23 16 March...

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