Chapter 22: Q3CP (page 906)
:A uniform magnetic field of 3 T points away from the perpendicular to the plane of a rectangular loop of wire 0.1 m by 0.2 m (Figure 22.14). What is the magnetic flux on this loop?
The value of the magnetic field is .
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Two coils of wire are near each other, positioned on a common axis (Figure 22.57). Coil 1 is connected to a power supply whose output voltage can be adjusted by turning a knob so that the current in coil 1 can be varied, and is measured be ammeter 1.
Current in coil 2 is measured by ammeter 2. The ammeters have needles that deflect positive or negative depending on the direction of current passing through the ammeter, and ammeters read positive if conventional current flows into the + terminal. Figure 22.58 is a graph of vs. time. Draw a graph of vs. time over the same time interval. Explain your reasoning.
Question: A thin rectangular coil lies flat on a low-friction table (Figure 22.75). A very long straight wire also lies flat on the table, a distance zfrom the coil. The wire carries a conventional current lto the right as shown, and this current is decreasing: , where tis the time in seconds, and aand bare positive constants. The coil has length Land width w, where w << z. It has Nturns of wire with total resistance R.
What are the initial magnitude and direction of the nonzero net force that is acting on the coil?You can neglect friction. Explain in detail. If you must make simplifying assumptions, state clearly what they are, but bear in mind that the net force is not zero.
A uniform, non-time-varying magnetic field of 3 T points 300 away from the perpendicular to the plane of a rectangular loop of wire 0.1 m by 0.2m (Figure 22.28). The loop as a whole is moved in such a way that it maintains its shape and its orientation in the uniform magnetic field. What is the emf around the loop during this move? In 0.1s the loop in Figure 22.28 is stretched to be 0.12m by 0.22 m while keeping the centre of the loop in one place. What is the average emf around the loop during this time?
A bar magnet is dropped through a vertical copper tube and is observed to fall very slowly, despite the fact that mechanical friction between the magnet and the tube is negligible (Figure 22.61). Explain carefully, including adequate diagrams.
A wire of resistance 10 Ω and length 2.5 m is bent into a circle that is concentric with and encircles a solenoid in which the magnetic flux changes from to in 0.1 s. What is the emf in the wire? What is the non-Coulomb electric field in the wire? What is the current in the wire?
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