All Questions
39
questions
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31
views
Current sensitivity in transformer scheme with SQUID
I've tried to determine the maximum current sensitivity in this transformer scheme but I'm not sure if my solution is valid. I need to find the relation between the current in the input transformer ...
0
votes
1
answer
35
views
What does "90 degrees ahead of phase" mean in inductance problems?
I've been working on this homework problem and I have determined that the induced EMF on the right coil is sin(x-90). However, I do not understand what "ahead of phase means." When I graph ...
- 101
1
vote
0
answers
127
views
Coilgun projectile force calculation
Please excuse me if I am completely wrong because I am a 9th grader but I hopefully am able to explain briefly about my problem. I was trying to create a function to calculate the Force of an iron ...
- 11
4
votes
1
answer
63
views
Why In the following $RL$ circuit, the connection to $b$ must actually be made an instant before the connection to $a$ Is broken? [duplicate]
In Resnick halliday, student 10th edition page - 795. In the topic current decay in RL circuit, the following statement is used, the connection to b must actually be made an instant before the ...
- 43
0
votes
1
answer
192
views
Self-inductance of a finite solenoid
Where did the $l$ in the denominator come from? I am talking about the $l$ in muNI/2l[...]?
I can't match LHS and RHS.
2
votes
1
answer
48
views
Find the inductance of the coil by potential difference of the circuit [closed]
A coil is connected in series with a 10.0 k$\Omega$ resistor. An ideal 50.0 V battery is applied across the two devices, and the current reaches a value of 2.00 mA after 5.00 ms. Find the inductance ...
- 23
3
votes
2
answers
246
views
Using Faraday's law twice
I have trouble understanding Faraday's law when there is an induced current which in turn induces another current in the same circuit. I shall illustrate my confusion with an homework problem and I ...
- 963
1
vote
1
answer
47
views
Induced current in a rotating coil? [closed]
I'm a little bit confused with this problem: Find the induced current in a rotating coil with resistance R and inductance L. What I tried is this (assuming N=1):
$$\epsilon =-\frac{\text{d}\phi}{\text{...
- 27
1
vote
2
answers
179
views
Electromagnetic induction at the centre of a cylinder with rotating current [closed]
A long circular tube of length 10 m and radius 0.3 m carries a current I along its curved surface as shown. A wire-loop of resistance 0.005 ohm and of radius 0.1 m is placed inside the tube with its ...
- 452
0
votes
1
answer
200
views
The self inductance of the motor of an electric fan is 10 H. In order to impart maximum powr of 50 Hz, it should be connected to a capacitance of [closed]
how can i solve this
(*)The self inductance of the motor of an electric fan is 10 H. In order to impart maximum powr of 50 Hz, it should be connected to a capacitance of
what is the concept behind ...
- 15
0
votes
1
answer
1k
views
Would the following 2 solenoids repel or attract each other? [closed]
Question:
Describe what will happen to two solenoids that are arranged next to each other as shown. The solenoids are the same length, and have the same number of turns and current flowing through ...
0
votes
2
answers
795
views
Solenoid Length In Inductance Formula
For a long solenoid, when the formula describes solenoid length, is it referring to the length of the wire wrapped around the magnetic core or the length of the core?
- 51
1
vote
1
answer
68
views
Loop law and charge redistribution [closed]
Addendum:
I have just read Strict(er) adherence to homework guidelines? and think that this is the reason why there have been three votes to close this topic. Notice, though, that I am not asking for ...
- 558
0
votes
1
answer
1k
views
Motion of a magnet inside a solenoid
I have a homework problem where a bar magnet is placed halfway inside a horizontal solenoid. A cut away shows that the magnet's north pole points to the left of the page and the south pole is outside ...
-1
votes
1
answer
195
views
Square loop moving into an homogenous magnetic field. How do i define the area as a function of time? [closed]
Looking through some old exams i found this problem where im supposed to derive an expression for the induced emf, ${\mathcal {E}}$(t), of a square loop moving into an homogenous magnetic field and ...
- 33