All Questions
13
questions
0
votes
1
answer
81
views
How do non-ideal inductors behave in a circuit?
I cannot comprehend how
can we break a seemingly non-ideal choke coil into just a pure resistor and inductor in series according to the following solution of a question.
Considering the data in the ...
- 5
0
votes
2
answers
49
views
$I²R$ loss in case of transformer
Suppose we have a 100 V A.C. supply, and we connect a 1 ohm resistor with it. Now the current through the resistor will be 100 A. Now we connect a 1:2 step up transformer with the A.C supply, and then ...
- 11
1
vote
0
answers
42
views
Is my reasoning about $ε = iR$ correct, where $ε$ denotes induced emf, $i$ denotes induced current, and $R$ is resistance of loop [closed]
I came up with the formula, $ε = iR$, where $ε$, $i$ and $R$ denotes induced emf, induced current and resistance of loop respectively. I did the following reasoning to prove this formula, am i right?
- 19
1
vote
1
answer
90
views
Validity of Ohm's Law due to Induced Electric
If we have a conducting loop of resistance R in a region of varying external magnetic field, how can we determine the current through the loop?
First, if we consider Ohm's Law, then we get that
$$\...
- 301
1
vote
3
answers
128
views
$RL$ Circuit Initial Condition - Why is $I$ continuous?
In a simple $RL$ circuit with a switch, the switch is closed at $t = 0$. Then the differential equation we are solving is $V_0 -L \frac{dI}{dt} = IR_0$, and the solution is $I(t)=\frac{V_0}{R_0}+ke^{-\...
- 171
1
vote
0
answers
98
views
Square coil circuit and variable magnetic field problem
I am attempting to solve the following problem.
A square coil of side $l = 40.6 \ cm$ and resistor $R = 95.5 \ \Omega$ is contained within the $xy$ plane. Within the same region a magnetic field, ...
- 115
0
votes
4
answers
543
views
What is Ohm's law for induced current?
In this book it is written on pg $313$ in the last paragraph that Ohms law i.e. $R (constant)=\frac{\epsilon_{ind}}{I}$ is valid for induced current in a circuit. They define $R$ to be the sum of the ...
- 480
1
vote
3
answers
834
views
Does load on electromagnet affect its current?
If we make an electromagnet by winding 3000 turns on 5-inch-long cast iron bar, and provide $12 \;\text{V}$ and $2 \;\text{A}$ of current, it will produce the magnetic field with certain magnitude.
...
- 129
0
votes
1
answer
72
views
How does current/component voltage phase difference calculated in pure circuits remain the same for mixed circuits?
In class, we derived the phase difference values between the component voltage and the circuit current for pure inductive and capacitive circuits. Later, while doing LR, RC, and LC circuits, we used ...
- 256
0
votes
2
answers
92
views
Nature of the current produced by a magnetic field?
Consider a loop made off with a conducting material with resistance $R$. This loop is in a uniform magnetic field. Then, thanks to Faraday's law, we know that a current will be induced in the loop. My ...
- 183
0
votes
1
answer
779
views
What is $v(t)$ in a sliding conducting rail in a magnetic field?
This is problem 7.7c from David J. Griffiths - Introduction to Electrodynamics.
A metal bar of mass $m$ slides frictionlessly on two parallel conducting
rails a distance $l$ apart. A resistor $R$ ...
- 3
2
votes
1
answer
1k
views
Do transformer follow Ohm's Law?
We khow that due to Ohm's Law,
$I$ is proportional to $V$
So if $V$ rises, $I$ should rise too. But in a transformer when $V$ rises, $I$ lessens. Why does this happen? It seems like transformers ...
- 1,400