Download Electromagnetism_HW... - Jaclyn Kuspiel Murray

Electromagnetism HW
What is the acceleration of a proton moving with a speed of 5.1 m/s at right angles to a magnetic
field of 2.1 T?
m/s2
2.
A proton high above the equator moves straight away from the Earth with a speed of 350 m/s.
Find the acceleration of the proton, given that the magnetic field at its altitude is 4.60 10-5 T.
Magnitude
m/s2
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Direction
3.
The artery in the figure has an inside diameter of 2.90 mm and passes through a region where the
magnetic field is 0.065 T.
(a) If the voltage difference between the electrodes is 205 µV, what is the speed of the blood?
m/s
(b) Which electrode is at the higher potential?
depends on the sign of the ions
Explain.
4.
top
bottom
Consider a current loop immersed in a magnetic field, as in the figure. It is given that B = 0.29 T
and I = 9.5 A. In addition, the loop is a square 0.41 m on a side. Find the magnitude of the
magnetic force exerted on each side of the loop.
N (on top side)
N (on bottom side)
N (on left side)
N (on right side)
5.
The long, thin wire shown in the figure is in a region of constant magnetic field B. The wire
carries a current of 6.2 A and is oriented at an angle of 7.5° to the direction of the magnetic field.
(a) If the magnetic force exerted on this wire per meter is 0.049 N, what is the magnitude of the
magnetic field?
mT
(b) At what angle will the force exerted on the wire per meter be equal to 0.014 N?
°
6.
Two parallel wires, each carrying a current of I = 3.7 A, are shown in the figure, where d = 6.0
cm. The current in wire 1 is in the opposite direction of wire 2. Find the direction and magnitude
of the net magnetic field at points A, B, and C.
Point A
Magnitude
µT
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Point B
µT
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Point C
µT
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Direction
7.
An emf is induced in a conducting loop of wire 1.32 m long as its shape is changed from square
to circular. Find the average magnitude of the induced emf if the change in shape occurs in 4.35 s,
and the local 0.109 T magnetic field is perpendicular to the plane of the loop.
V
8.
The figure shows a zero-resistance rod sliding to the right on two zero-resistance rails separated
by the distance L = 0.50 m. The rails are connected by a 12.5 resistor, and the entire system is
in a uniform magnetic field with a magnitude of 0.750 T.
(a) Find the speed at which the bar must be moved to produce a current of 0.125 A in the resistor.
m/s
(b) Would your answer to part (a) change if the bar was moving to the left instead of to the right?
---Select---
Explain.
9.
The light bulb in the circuit shown below has a resistance of 33 and consumes 6.0 W of power
when the 1.25 m long rod moves to the left with a constant speed of 3.1 m/s. Now suppose the
mechanical power delivered to the rod is 7.5 W.
(a) Find the current in the circuit.
A
(b) Find the speed of the rod.
m/s
10.
The rms current in an ac circuit with a resistance of 170 is 0.75 A.
(a) What is the average power consumed by this circuit?
W
(b) What is the maximum power consumed by this circuit?
W
11.
You connect both ends of a copper wire, with a total resistance of 0.10 Ω, to the terminals of a
galvanometer. The galvanometer has a resistance of 895 Ω. You then move a 10.0-cm segment
of the wire upward at 1.4 m/s through a 2.0 10-2 T magnetic field. What current will the
galvanometer indicate?
µA
12.
The power supply in a laptop computer requires an effective voltage of 9.0 volts from a 120 V
line.
(a) If the primary coil has 465 turns, how many does the secondary coil have?
turns
(b) A 135 mA current is in the computer. What current is in the primary circuit?
mA