15. What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force?

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16. Which electromagnetic device has a movable iron core called a plunger?

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17. Which electromagnetic device contains an armature?

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18. The polarity of induced voltage while a field is collapsing is

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19. The flux density is ___ when the magnetic flux is 9 µWb and the cross-sectional area of the magnetic field is 5 × 10–3 m2.

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20. After the magnetizing force has been removed, the ratio of the remaining magnetic flux to the saturated magnetic flux is called _____________.

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21. You can determine the direction of the lines of force surrounding a conductor by using _____.

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