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High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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sir why is it difficult to calculate the mutual induction through outercoil

3 years ago by Manoj Pathak

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The charging current in an RC circuit is CV(1-e^(-t/RC)). The formula used here is incorrect or maybe in the question, it was a discharging capacitor? Please clarify. Thank you

3 years ago by

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Sir why cant we take mutual induction due to induced current

4 years ago by Deepak Kaza

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Sir, I would like to ask you that for JEE Mains are the Basic Lectures enough, or is it recommended to watch the Advanced Illustrations also for JEE Mains?

4 years ago by

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Calculate mutual induction of toriod. (In general)

5 years ago by Raghav

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Sir how to point dot in indicator?

5 years ago by Shaktiprasad Satpathy

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why is the flux from south to north????...bcoz magnetic field lines are always from north to south!!!

6 years ago by Subham Subhasish Panda

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Respected sir how does series LC ckt with a DC battery work ??

6 years ago by

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P.D across A and B is = 5V ?

6 years ago by Ayushi Badholiya

Ans 1 ->

yes! as you can observe the 4ohm resistance is in parallel with the inductor and as no current will flow through the 8 ohm resistance ,so the potential difference will be 5v

6 years ago by Michael jackson

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You could have found mutual inductance with the help of small coil on big too OR have used Baxis due to small coil on big coil * Area of big coil to find the flux. In these conditions the answers is different. WHY?

6 years ago by Rupesh Koirala

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Respected sir i didn't found the topic considering mutual induction. I want to know what happens in that case..

7 years ago by Shah Darshan Jagdishbhai

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sir i had a query. sir we write battery emf = l*di/dt. and we know l*di/dt is the induced emf in inductor.. sir so why doesn't the induced emf completely oppose the battery and hence results to zero current in the ckt?

7 years ago by Ajay Vashishtha

Ans 1 ->

as induced emf is receiving energy for induction from the battery only and it cannot oppose the battery 100% to force the current to zero as if i becomes zero induced emf will also become zero and again battery will start supplying the current...

7 years ago by Physics Galaxy

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Sir how could Potential difference b/w A&B Is 12....i think it should be 18

7 years ago by Shubhit Talus

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Im sorry sir...i realised my mistake

7 years ago by Shubhit Talus

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Thats good...

7 years ago by Physics Galaxy

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Sir why the potential diff. across 4H inductor is taken as V(D)-V(B)=-40 ; why cant we take it as V(B)-V(D)=40 in this case we would get a diff. answer?

7 years ago by

Ans 1 ->

by looking at the polarity of the inductor we can say that inductor wants to increase the current; that implies the current across DB was initially decreasing at a const. rate (correct me if I am wrong)

7 years ago by

Ans 2 ->

What is specified in figure of question, we are taking signs accordingly only...

7 years ago by Physics Galaxy

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Sir..when a current is carried by a hollow cylinder why it doesn't produce any Magnetic Field in the interior region ??

7 years ago by

Ans 1 ->

No... inside magnetic induction is zero due to surface currents as all fields due to elemental currents gets cancelled out...

7 years ago by Physics Galaxy

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I think that the + & - sign on an inductor have been wrongly put by you.

8 years ago by UMAX

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Sir... here u haven't considered the magnetic field dude to the cylinder of radius b so u must subtract 1/2u0Jd right??

8 years ago by Venkat S Raghavan

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what is inductor conserving flux or current

9 years ago by ayush malpani

Ans 1 ->

flux at an instant...

9 years ago by Physics Galaxy

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is nt steady current reqd for kvl

9 years ago by ayush malpani

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No... KVL is just conservation of energy we apply at an instant in a circuit branch...

9 years ago by Physics Galaxy

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in second case the current should flow from high to low pot and we are naming reverse

9 years ago by ayush malpani

Ans 1 ->

Please see the video carefully here current is supplied by an external source not due to the induced emf... you are misinterpreting the situation... all signs and symboles taken are correct in video...

9 years ago by Physics Galaxy

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in the two figures of circuit in video why in first no opposition it is also aclosed loop andflux through it is also increase.

9 years ago by ayush malpani

Ans 1 ->

In first also opposition is there but very low so we can neglect it but in second due to the shape of conductor flux linkage is more thats why opposition is siginificant...

9 years ago by Physics Galaxy

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Sir, I didnt got how 6 ohm and 4 ohm are in parallel..

9 years ago by Anand Rahangdale

Ans 1 ->

Here if you replace the battery with its internal resistance i.e. o you can see 6 and 4 ohm resistances are in series...

9 years ago by Physics Galaxy

Ans 2 ->

in parallel not in series...

9 years ago by Physics Galaxy

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but here, it doesnt seems inductor is connected in parallel with the resistor...

9 years ago by Anand Rahangdale

Ans 1 ->

Yes it is...but current through both is same as no external circuit is there and in such cases we consider it as a single branch circuit with all components in series...

9 years ago by Physics Galaxy

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di2/dt=+10 A/s correct me if I am wrong?

9 years ago by Bhavya Mehta

Ans 1 ->

No its -10 as given in solution...

9 years ago by Physics Galaxy

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All the lectures given by are excellent

9 years ago by ramesh nagda

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Thanks

9 years ago by Physics Galaxy

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where can we get the proof of relation M= Sq root of L1XL2

9 years ago by ramesh nagda

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Does inductance of a coil depend on temperature?

10 years ago by Bhavya Popli

Ans 1 ->

permeability of medium depends on the temperature and due to this inductance also varies..

9 years ago by Physics Galaxy

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sir please tell me how had you determined the polarity of the inductor of inductance 4H

10 years ago by kartik prakash

Ans 1 ->

As potential at C is zero and at B is 40 means B is at high potential...

9 years ago by Physics Galaxy

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