Chapter 4: Q3DQ (page 1012)
In Figure below, if coil is turned so that its axis is vertical,
does the mutual inductance increase or decrease? Explain.
Answer
The mutual inductance is decrease
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The current in a wire varies with time according to the relationship
. (a) How many coulombs of charge pass a cross section of the wire in
the time interval between and role="math" localid="1655721302619" ? (b) What constant current would transport the
same charge in the same time interval?
A circular area with a radius oflies in the xy-plane. What is the magnitude of the magnetic flux through this circle due to a uniform magnetic fieldlocalid="1655727900569" (a) in the direction of +z direction; (b) at an angle offrom the direction; (c) in the direction?
A resistor with resistance is connected to a battery that has emf 12.0 V and internal resistance . For what two values of will the power dissipated in the resistor be 80.0 W ?
(a) At room temperature, what is the strength of the electric field in a
12-gauge copper wire (diameter ) that is needed to cause a
current to flow? (b) What field would be needed if the wire were made of silver
instead?
Two coils are wound around the same cylindrical form. When the current in the first coil is decreasing at a rate of , the induced emf in the second coil has magnitude . (a) What is the mutual inductance of the pair of coils? (b) If the second coil has 25 turns, what is the flux through each turn when the current in the first coil equals ? (c) If the current in the second coil increases at a rate of , what is the magnitude of the induced emf in the first coil?
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