_____ 1. Suppose a magnetic field points from the left edge of this page to the
ID: 2121672 • Letter: #
Question
_____ 1. Suppose a magnetic field points from the left edge of this page to the right edge of this page. The force on a positive charge moving in a direction into the page would be:
Zero
Toward the top of the page
Toward the bottom of the page
Toward the left edge of the page
Out of the page.
_____ 2. Which of the following laws states that an induced electric current always opposes the change that caused the current?
Faraday's Law
Lenz's Law
Ampere's Law
Gauss's Law
The law of Transformers
_____ 3. A transformer has a primary (input) voltage of 110 VAC and a secondary voltage(output) of 6 VAC. If there are 440 turns on the primary, the number of turns on the secondary is:
a. 40
b. 2017
c. 110
d. 220
e. 24
_____ 4. Which of these types of electromagnetic radiation has the longest wavelength?
gamma rays
ultraviolet
radio waves
infrared
visible light
_____ 5. A wire loop rests on this page. An electromagnet is above the loop with the S pole facing downward. As viewed from above, which of these would create clockwise current in the loop?
Turn the electromagnet off
Increase the strength of the electromagnet
Move the electromagnet closer to the loop
A or C
B or C
______ 6. The outlet in your room provides 120 Volts RMS. RMS stands for:
Rolling mode sine
Regular mean standard
Really mean stuff
Root mean square
Right modulated sine
______ 7. In an RLC circuit, which of the following definitely decreases as frequency increases?
Resistance
Capacitive Reactance
Inductive Reactance
Impedance
Dissipated power
______8. One similarity between inductors and capacitors is that they both:
Have high reactance at high frequencies
Have high reactance at low frequencies
Store but do not use energy
Create energy in a circuit
Are measured in Henries
______ 9. An RC circuit consists of a 150 ohm resistor in parallel with an uncharged
22 %u03BCF capacitor connected through a switch to a 6 volt battery. When the switch is closed, the current in the circuit is:
a) high initially and falls to zero
b) low initially and rises to 6 Amperes
c) a constant 6 amperes
d) high initially and falls to 40 mA
e) low initially and rises to a number that can't be determined
______ 10. A 0.63 T magnetic field passes through a circular ring with radius 2.5 cm at an angle of 16 degrees with the normal to the ring. The magnitude of the magnetic flux through the ring is:
1.19 x 10-3 Wb
3.36 x 10-3 Wb
3.49 x 10-4 Wb
1.6 x 10-4 Wb
12.2 Wb
a) If point A is 5 cm from the wire, calculate the magnitude of the magnetic field at point A due to the wire.
b) In what direction is this field? Explain how you know
Explanation / Answer
1. Towards the top of the page
2. Lenz's Law
3. V1/V2=N1/N2; 110/6 = 440/N2 => N2= 24
4. Radio Waves
5. move the electromagnet closer to the loop
6.Root Mean Square
7. capacitive reactance
8. store but do not use energy
9. high initially and falls to zero
10. 0.63(Wb/m^2)*Area of loop(m^2)*cos(16deg) = 1.19x10^-3 Wb
11
a.for infinitely long wire
H=I/[2 *pi*r]=3.4/[2*pi*0.05]=10.8 A/m
b. out of the page (use right hand rule)
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.