Question

Which of the following is/are TRUE?

a. Faraday’s law of electromagnetic induction states that the induced emf or current in a circuit is directly proportional to the time rate of change of the magnetic flux in the circuit

b. There is induced emf or current in a circuit of the magnetic field in the circuit is very high

c. There is induced emf or current in a circuit if the area of the circuit is not too big

d. There is induced emf or current in a circuit if the circuit is rotated in a constant magnetic field

e. When the current in a circuit is changing with time, emf or current can be induced in another circuit nearby

Answer #1

a. True (Faraday's law)

b. False (induced emf depends on the rate of change of magnetic flux, current won't be induced in the circuit if magnetic flux through it is not changing)

c. False (it doesn't matter if the are of the circuit is large or small, emf won't be induced if flux through the circuit is not changing)

d. False (based on Faraday's law)

e. True, since current is changing, magnetic field produced by this current will be changing and so will magnetic flux and as per Faraday's changing magnetic flux will induced electric current in the circuit.

Faraday’s law indicates that the induced emf and the change in
flux have opposite algebraic signs. Does this mean that the
direction of induced magnetic field is always opposite to original
magnetic field direction? Why yes or why not?

Part A. According to Faraday’s Law, an emf can be formed by
A. a changing electric field
B. a changing magnetic field
C. a constant electric field
D. a constant magnetic field
I think it might be B, idk.
Part B. You are facing a copper ring and insert a magnetic,
north first, into the ring. Which direction is the induced current
in the ring.
A. Counterclockwise
B. Clockwise

A)According to Faraday’s Law, a changing magnetic field induces
a voltage. One of the things that can be done to increase the
induced voltage is to increase the magnetic field strength. State
at least two other things that can be changed to increase the
induced the voltage.
B)State the electromagnetic spectrum in order from low frequency
to high frequency. Also state, with an arrow the direction of the
electromagnetic spectrum from short wavelength to long
wavelength.

Using Faraday’s Law equation, answer the following
mathematical questions.
A plane circular loop of conducting wire has a radius r = 8m and
N = 4 turns. It is located in a uniform magnetic field. The
magnetic field’s direction makes a 75° angle with respect to the
normal of the loop. The magnitude of magnetic field B increases at
a constant rate from B1 = 3.2 T to B2 = 4.7 T in a time interval of
t =5s. If...

Faraday's law states that a changing magnetic field will create
an electric field that curls around the magnetic field. To quantify
this, we use the expression of flux (Φ) which is the magnetic field
strength multiplied by the area (A) it’s passing through. This is
given by: Φ = ??
The electric field is applied to the outside edge of this area.
This created an electric potential that is referred to as an
electro-motive force (EMF, ε). Faraday’s law can...

3.Explain why if a CD power supply is used, only when the power
supply is turned on or of there is an induced current in the second
coil (secondary).
4. Explain why when the switch is on, and there is a direct
current through the circuit, there is no induced electric current
in that coil.
Electromagnetic Induction
I. Objectives
1. Verify the Faraday-Lenz‘s Law
2. Perform measurements with a set of coils to understand how a
transformer works.
II. Theory
In...

Note: I'm really only struggling with part
c.
Lorentz Law, Ampere's Law, and Faraday's Law
a.) Two equal current carrying infinite wires with current I =
2amps and separation d = 0.5m repel one another. Find the force per
unit lengh (f). Give the relative directions of the currents in the
wires by drawing a diagram.
b.) Find the strength of the magnetic field (B) inside a
solenoid with n= 200 turns/meter (loops per unit length) and
carrying a current...

A conducting rod is pulled horizontally with constant force F=
3.40 N along a set of rails separated by d= 0.380 m. A uniform
magnetic field B= 0.600 T is directed into the page. There is no
friction between the rod and the rails, and the rod moves with
constant velocity v= 4.80 m/s.
Using Faraday's Law, calculate the induced emf around the loop in
the figure that is caused by the changing flux. Assign clockwise to
be the positive...

Written Problem: Induction from a falling
magnet
We have a small magnet with a magnetic moment of m = 0.1
Am2 (remember: magnetic moment is defined as m = IA -
see page 932 of book for the definition). We also have coils of
wire. The coils are made out of 100 circular loops of a single
wire. A single loop has a radius of 10 cm. The thickness of the
wire has a circular cross section with a 0.5...

1- A 10.0-W resistor and a 20.0-W resistor are connected in
series with a potentiometer and a 9.0-V battery.
What should the potentiometer be set at for a total equivalent
resistance of 50.0 W in this circuit?
a. 10 Ω
b. 20 Ω
c. 30 Ω
d. 50 Ω
2-Batteries are most often connected in
a. series.
b. parallel.
c. both series and parallel.
d. neither series nor parallel.
(i think parallel)
3- A 9.0-V battery delivers a 1.3-A current...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 6 minutes ago

asked 7 minutes ago

asked 7 minutes ago

asked 7 minutes ago

asked 8 minutes ago

asked 8 minutes ago

asked 29 minutes ago

asked 32 minutes ago

asked 38 minutes ago

asked 43 minutes ago

asked 48 minutes ago

asked 55 minutes ago