14.3 Energy in a Magnetic Field

Where the work of building up a current is stored, the density held per unit volume, and the total between the conductors of a coaxial cable.

University Physics Volume 2, 14.3 Energy in a Magnetic Field

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4 exercises

14.3 Exercise 1

How much energy is stored in the inductor of the reference after the current reaches its maximum value?

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14.3 Exercise 4

Suppose that a rectangular toroid has 2000 windings and a self-inductance of 0.040 H. If $h = 0.10 \text{m}$ , what is the current flowing through a rectangular toroid when the energy in its magnetic field is $2.0 \times 10^{−6} \text{J} ?$

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14.3 Exercise 6

A 10-H inductor carries a current of 20 A. How much ice at $0 ° \text{C}$ could be melted by the energy stored in the magnetic field of the inductor? (Hint: Use the value $L_{\text{f}} = 334 \text{J}/\text{g}$ for ice.)

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14.3 Exercise 8

A current of 1.2 A is flowing in a coaxial cable whose outer radius is five times its inner radius. What is the magnetic field energy stored in a 3.0-m length of the cable?

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