All Questions
Tagged with electric-circuits magnetic-fields
99
questions
2
votes
1
answer
132
views
Potential difference in a ring
Basically in a circuit there is a cell with a positive and negative end, and current flows through it - electrons are pushed by negative electrode and attracted to the positive electrode. But if say a ...
- 137
0
votes
3
answers
69
views
Are there losses in an ideal transformer?
In a circuit with an AV power source $V$ and a zero-resistance ideal coil, the power from the source. $P_{in} = IV$ is equal to the rate of change in the magnetic energy $U_B$ stored in the coil. The ...
- 2,141
1
vote
0
answers
57
views
Static toroidal magnetic field rotating inside toroidal winding
what would happen if I took a toroidal core, generated a static toroidal magnetic field in the core and then rotated the core around it's symmetry axis within a larger stationary toroidal winding ...
- 91
2
votes
2
answers
333
views
Inductance of air core inductor with and without load
I have an air core inductor whose inductance , as measured with LCR meter, is 45.1uH and quality factor is 4.4. When i place an Aluminum alloy (which is a Non-magnetic Material) as Load inside the ...
- 21
0
votes
0
answers
19
views
Effect of projectile movement inside the coil launcher
I'm simulating a simple coil launcher system where there is a round coil , a capacitor and a round projectile which at first is placed at the start of the coil.
so the whole circuit is a simple RLC ...
1
vote
0
answers
62
views
Weird EMF tester readings?
I bought a Digital EMF Tester Electric and Magnetic Field Radiation Detector here.
At first, I thought it was a metal detector since keyboards (without being inserted into a USB port) cause alarm, ...
- 117
0
votes
1
answer
60
views
Why EMF is induced in the following situation?
Why emf is induced in the conducting wire even though there is no flux change or motion(for motional emf) in the following situation?
A conducting loop in the shape of right-angled isosceles triangle ...
- 187
0
votes
2
answers
354
views
How does electricity actually work?
This question is not similar to what I have read so far in this site. I am just trying to understand what electricity actually is. I have come to know that when charges move or vibrate in a wire by ...
0
votes
1
answer
124
views
In The question given below, why the length for calculating reluctance is taken by those dotted lines?
The question is as follows:
For the core shown in Fig. 3.20, it is required to produce a flux of 2 mWb in the limb CD. The entire core has a rectangular cross section of 2cm × 2cm. The magnetizing ...
- 31
1
vote
1
answer
265
views
Does the electric field ($E$ caused by induction) of a moving conductor in a magnetic field drop when connected to a curcuit?
We know that when a conductor moves in a homogenous magnetic field that is perpendicular to itself due to the amount of electric charge gathered on one end of the conductor( as a result of the lorentz ...
0
votes
0
answers
118
views
Back emf for simple DC motor in radial magnetic field
With a basic DC motor setup of a single coil spinning in a linear magnetic field, the back emf produced is a sin wave, as the change in the angle between the plane of the coil and the magnetic field ...
- 135
1
vote
1
answer
164
views
Calculating Induced EMF in Wireless LED Circuit
I have built the following circuit to power a wireless LED and my calculations and measurements do not give the same values. I am measuring a voltage nearly 6 times larger than I would expect in my ...
- 113
0
votes
2
answers
85
views
Proving induced voltages will always cancel in circuit that is in a $B$-field
Is there a way to conceptually prove that no matter the shape of the wire, when it is completely inside a $B$-field the induced voltages will cancel (without having to use the right-hand rule an ...
- 13
1
vote
2
answers
224
views
Doubling the length of a solenoid doubles its inductance. Two identical solenoids in series have up to four times the inductance due to M. Why?
The inductance of a long solenoid with $N_o$ turns and a length $l_o$ is
$$L_o=\pi r^2 \mu_0\frac{N_o^2}{l_o}$$
If I now make a new solenoid, $L_{new}$, with double the length of the original ($l_{new}...
- 1,581
0
votes
2
answers
633
views
Relation between magnetic moment in current carrying loop and magnetic moment in bar magnet
We know that for a current carrying loop magnetic moment can be calculated by
$$\overrightarrow{M} = I\times \overrightarrow{A}$$
Where I is current in loop and A is the area enclosed by the loop
And ...
