37 Answered Questions for the topic electromagnetism

Electromagnetism Physics Electrical Engineering

29d

Power and coil rotation

Suppose that there is a single generator providing power to your house. Right now, the wire coil is spinning at a certain number of rpms within a magnetic field, generating current via Faraday's... more
Electromagnetism Chemistry Physics

04/15/21

Photon to break C=C bond

The C= C bond is very strong with a large bond energy of 962 kJ/mol. Calculate the frequency of the photon required to break this bond. Calculate the wavelength of the photon required to break a... more

03/13/21

Find the voltage induced across a coil of 22mH if the rate of change of current through the coil is...

Find the voltage induced across a coil of 22mH if the rate of change of current through the coil is...a.) 1 A/sb.) 1 mA / msc.) 2 mA / 10 μs
Electromagnetism Math Science Physics

03/13/21

Find the voltage induced across a coil of 22mH if the rate of change of current through the coil is...

Find the voltage induced across a coil of 22mH if the rate of change of current through the coil is...a.) 1 A/sb.) 1 mA / msc.) 2 mA / 10 μs
Electromagnetism Physics

09/04/20

Electrical Potential to Electrical Field

If the electrical potential is V=x3y2 Volt at any point of an cartesian coordinate system, what is the electrical field at (x,y,z)=(4,2,1) metres.a) -192i -256j -12kb) 0c) -192i -256jd) -64y2i... more
Electromagnetism Physics Electrical Engineering

07/22/20

electromagnetism

A 4uC linear charge is distributed in a square of side 0.7m, which is contained in the 'yz' plane and has its center at the origin. The 'x' axis passes through the center of the square. Find the... more
Electromagnetism Science Physics Optics

06/05/20

Are radio waves and sound the same?

So the electromagnetic spectrum: radio waves, micro waves, infrared rays, visible light, ultra violet rays, x rays, gamma rays, cosmic rays. Now visible range is 390 to 700 nanometers, beyond 700... more

05/13/20

Physics/Magnetism Question

A scrapyard uses a big electromagnet to move around large metal objects such as cars and appliances. If the operator needed to drop a car to a new space, what would he need to do for this to... more

05/13/20

Physics/Magnetism Question

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. It consists of a solenoid (wire) wrapped around a bar of iron or other ferromagnetic material. A... more
Electromagnetism Physics

05/08/20

Help with physic please ?

When AC is changed into DC to charge a laptop or phone, is the resulting voltage perfectly constant?A. YesB. No, but it can be made pretty closeC. No, in fact sometimes it's negative
Electromagnetism Physics

05/01/20

Physics RLC question

04/27/20

Number of electrons as a function of time

Find the number of electrons as a function of time if: i(t) = 10 cos(t), to and q(to) = 0
Electromagnetism

04/13/20

electromagnetism

Q3.
Electromagnetism Physics

03/29/20

EMF of a square conductor moving in homogeneous magnetic field

We have a homogeneous magnetic field of strength 1T.There is a copper SQUARE conductor, moving by constant speed 1m/s in a direction parpendicullar to magnetic field lines, so we can measure... more
Electromagnetism Physics Electrostatics

02/28/20

for this coulomb's law question, why can't i solve by splitting e into Ex and Ey and then combining given Ey is zero? I get an answer 10^-30 instead of 10^-10.

The solution here says to figure it out by using cos theta as a factor, but I don't understand why I cannot just break it up into components? Figure shows two charge particles on an x acis -q on... more
Electromagnetism Physics

02/01/20

Physics HW question

Two charges are placed on the x axis. One of the charges (q1 = +9.0 µC) is at x1 = +3.2 cm and the other (q2 = -24 µC) is at x2 = +8.1 cm.(a) Find the net electric field (magnitude and direction)... more
Electromagnetism Science Physics Physical Science

11/13/19

What is the total resistance of this circuit, and what type of circuit is this?

What is the total resistance of this circuit? And what type of circuit is this? I can’t tell if it’s parallel or series. (Physical science 10th grade) here is the link to the circuit diagram. ... more
Electromagnetism Physics Electrical Engineering

10/30/19

Three Resistors are connected across a 24V battery in parallel. Find (a) Equivalent Resistance

Three Resistors are connected across a 24V battery in parallel. R1= 4Ω R2 = 8Ω R3 = 12ΩFind (a) Equivalent Resistance of the Circuit (b) Current in each Resistor

How does regenerative breaking work in ac 3 phase motors?

Please explain Regenerative breaking, where an induction motor can be used with a VSD and back feeds power to the VSD? How does is work does the motor act as a generator and create EMF or is it... more

08/03/19

What's the core difference between the electric and magnetic forces?

I require only a simple answer. One sentence is enough... (It's for high school physics)
Electromagnetism Physics Work Forces

07/31/19

Work done by the Magnetic Force?

The magnetic part of the Lorentz force acts perpendicular to the charge's velocity, and consequently does zero work on it. Can we extrapolate this statement to say that such a nature of the force... more
Electromagnetism Physics Forces Black Holes

07/30/19

Why don't black holes form from forces other than gravity?

Gravity is the weakest of the fundamental forces, so what is so special about gravity that it can form an inescapably strong field while a force like the EM force cannot? It seems to me that if... more

07/29/19

What is the cause of the normal force?

I've been wondering, what causes the normal force to exist? In class the teacher never actually explains it, he just says "It has to be there because something has to counter gravity." While I... more
Electromagnetism Physics Forces Electric Fields

07/17/19

Are the field lines the same as the trajectories of a particle with initial velocity zero?

Is it true that the field lines of an electric field are identical to the trajectories of a charged particle with initial velocity zero? If so, how can one prove it? The claim is from a german... more
Electromagnetism Physics

07/17/19

Electromagnetism

Two metal plates are squares of 12 cm by 12 cm, separated by 1.0 mm of air. Wires connected to each plate are also connected to a 9.0 V battery. After a long time, the battery is disconnected and... more

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