Physics II Pt. 2

25 July 2022
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16 test answers

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question
What is the equivalent resistance of group (a) of resistors shown in the figure? (Figure 1)
What is the equivalent resistance of group (a) of resistors shown in the figure? (Figure 1)
answer
Req = 11.0 ?
question
What is the equivalent resistance of group (b) of resistors shown in the figure?
What is the equivalent resistance of group (b) of resistors shown in the figure?
answer
Req = 9.0 ?
question
What is the equivalent resistance of group (a) of resistors shown in the figure? (Figure 1)
What is the equivalent resistance of group (a) of resistors shown in the figure? (Figure 1)
answer
Req = 1.0 ?
question
What is the equivalent resistance of group (b) of resistors shown in the figure? (Figure 1)
What is the equivalent resistance of group (b) of resistors shown in the figure? (Figure 1)
answer
Req = 1.0 ?
question
What is the equivalent resistance of group (c) of resistors shown in the figure? (Figure 1)
What is the equivalent resistance of group (c) of resistors shown in the figure? (Figure 1)
answer
Req = 0.5 ?
question
What is the equivalent resistance between points a and b in the figure? (Figure 1)
What is the equivalent resistance between points a and b in the figure? (Figure 1)
answer
Rab = 24 ?
question
What is the equivalent capacitance of the three capacitors in the figure? (Figure 1)
What is the equivalent capacitance of the three capacitors in the figure? (Figure 1)
answer
C = 37 ?F
question
What is the equivalent capacitance of the three capacitors in the figure? (Figure 1)
What is the equivalent capacitance of the three capacitors in the figure? (Figure 1)
answer
C = 8.9 ?F
question
What is the time constant for the discharge of the capacitors in the figure (Figure 1)?
What is the time constant for the discharge of the capacitors in the figure (Figure 1)?
answer
? = 2.0 ms
question
The element niobium, which is a metal, is a superconductor (i.e., no electrical resistance) at temperatures below 9 K. However, the superconductivity is destroyed if the magnetic field at the surface of the metal reaches or exceeds 0.10 T. What is the maximum current in a straight, 4.0-mm-diameter superconducting niobium wire?
answer
I = 1000 A
question
A solenoid used to produce magnetic fields for research purposes is 1.5 m long, with an inner radius of 25 cm and 1500 turns of wire. When running, the solenoid produced a field of 1.3 T in the center. Given this, how large a current does it carry?
answer
I = 1.0 kA
question
The aurora is caused
answer
46 cm ... 15 m
question
Early black-and-white television sets used an electron beam to draw a picture on the screen. The electrons in the beam were accelerated by a voltage of 3.0 kV; the beam was then steered to different points on the screen by coils of wire that produced a magnetic field of up to 0.68 T . What is the speed of electrons in the beam?
answer
3.2 x 10? m/s
question
What magnetic field strength will levitate the 2.0 g wire in the figure? (Figure 1)

What is the direction of the magnetic field?
What magnetic field strength will levitate the 2.0 g wire in the figure? (Figure 1) What is the direction of the magnetic field?
answer
0.13 T Out of the page
question
A current loop in a motor has an area of 1.35 cm2 . It carries a 240 mA current in a uniform field of 0.62 T . What is the magnitude of the maximum torque on the current loop?
answer
? = 2.0Γ—10?? N?m
question
In (Figure 1), suppose the magnet on the right is fixed in place and the magnet on the left is free to pivot about its center. Will the magnet on the left start to rotate? If so, will it initially rotate clockwise or counterclockwise?
answer
It will rotate in the clockwise direction.