You perform experiments using an apparatus that has two insulated wires wrapped around a cardboard tube (Figure P21.3). Determine the direction of the current in the bulb when (a) the switch is closing and the current in coil A is increasing, (b) the switch has just closed and there is a steady current in coil A, and (c) the switch has just opened and the current in coil A is decreasing.

You perform experiments using an apparatus that has two insulated wires wrapped around a cardboard tube (Figure P21.3). Determine the direction of the current in the bulb when (a) the switch is closing and the current in coil A is increasing, (b) the switch has just closed and there is a steady current in coil A, and (c) the switch has just opened and the current in coil A is decreasing.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Electromagnets

The word "electromagnet" is composed of two words, ‘electro’ and ‘magnet’. It is a type of magnet in which an electric current helps in the generation of a magnetic field. Electromagnets usually consist of two major parts, wire and a coil around which the wire is wound. This is called a solenoid. When an electric current is allowed to pass through the coiled wire, the electric current produces a magnetic field. This magnetic field is present only when current is passing through the wire.

Question

12. You perform experiments using an apparatus that has two insulated wires wrapped
around a cardboard tube (Figure P21.3). Determine the direction of the current in the
bulb when (a) the switch is closing and the current in coil A is increasing, (b) the switch
has just closed and there is a steady current in coil A, and (c) the switch has just opened
and the current in coil A is decreasing.
Figure P21.3
Circuit A
Coil A
a
Coil B
b

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Step 2: a) Determine the direction of current in bulb when current in A is increasing:

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Step 3: b) Determine the direction of current in bulb when current in A is steady:

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Step 4: c) Determine the direction of current in bulb when current in A is decreasing:

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