Biology; Chemistry; Physics: Post your doubts here!

[Awesome12]

I did all the MCQs of Electromagnetic Induction from redspot topical (2001-11) and haven't come across Fleming's right hand rule. Also, there are only 2 paths for light rays that we have to learn for diverging lenses, right?

Which rule would you use here?

My sir told us that for the deflection of beta particles (fast moving electrons), we use the FRH. For this question as well, our sir made us use the FRH

But yeah I think you are also right, as the middle finger shows us the direction of current that is opposite to the direction of electron flow, and the correct answer will come by using the FLH

 

[DaniyalK]

Yeah, my teacher told us to reverse the direction of current in case of electron flow and use LHR.

 

[M.Omar]

Which rule would you use here?
View attachment 40837
My sir told us that for the deflection of beta particles (fast moving electrons), we use the FRH. For this question as well, our sir made us use the FRH

The interaction would exhibit a force on the charged particles and,hence,FLH,not FRH, ought to be used:the answer would be B

 

[Awesome12]

Yeah, my teacher told us to reverse the direction of current in case of electron flow and use LHR.

The interaction would exhibit a force on the charged particles and,hence,FLH,not FRH, ought to be used:the answer would be B

Thanks I get it now

 

[Faizan Muhammmad]

Do you people have any plan to get out of sticky situations in paper?

 

[princess Anu]

The interaction would exhibit a force on the charged particles and,hence,FLH,not FRH, ought to be used:the answer would be B

But why won't it be D? How do we know Thumb pointing upwards represents deflection towards the top of the page or out of the page?

 

[princess Anu]

Cu +H2SO4 ---------> CuSO4 + H2
why does Cu replaces H here? even though H is more reactive than Cu.

This is because there are two types of acids
1 oxidising Eg: diltue HNO3 and Con HNo3 , Conc H2So4
2.non- oxidising eg: Dilute HCL, con HCL and dilute H2SO4
Oxidising acids can even react with metals below hydrogen.

 

[Faizan Muhammmad]

But why won't it be D? How do we know Thumb pointing upwards represents deflection towards the top of the page or out of the page?

we are discussing here in 2 dimensions
while in exam the thumb will clearly show you
and whatever happens it will move ALWAYS perpendicularly
if D it becomes parallel

 

[Awesome12]

But why won't it be D? How do we know Thumb pointing upwards represents deflection towards the top of the page or out of the page?

 

[asadalam]

funky brat
I have never ever used RHR and don't worry we dont have to use it.In case of electron flow it is opposite to flow of conventional current so we can find direction in magnetic field and just reverse.
Also in that pollen wala question i wrote that we can use a small brush to remove the pollen grains from the anther and place some of them on a slide and stain with dye(or as u said iodine solution) and lower cover slip.The rest you should know.

 

[asadalam]

View attachment 40849

I think your guy has some muscular weakness

 

[***amd***]

It is for special circumstances
go break a leg or something

You still use win xp ?

hmm... good idea i surely will

yeah, what's so astounding?

 

[Awesome12]

I think your guy has some muscular weakness

*deficiency
use proper terms. Bio ka ATP sar par he

 

[Faizan Muhammmad]

hmm... good idea i surely will

yeah, what's so astounding?

I was able to run win 8 on my ooooolddd laptop
why you living in stone age ?

 

[***amd***]

View attachment 40849

Ma Shaa Allah 0.0 haath to check karo! wah!

 

[***amd***]

I was able to run win 8 on my ooooolddd laptop
why you living in stone age ?

-.- what if i tell you, xp runs good on PC.

 

[Faizan Muhammmad]

-.- what if i tell you, xp runs good on PC.

I wouldnt be surprised

 

[funky brat]

Which rule would you use here?
View attachment 40837
My sir told us that for the deflection of beta particles (fast moving electrons), we use the FRH. For this question as well, our sir made us use the FRH

But yeah I think you are also right, as the middle finger shows us the direction of current that is opposite to the direction of electron flow, and the correct answer will come by using the FLH

It's simple and I do it using Left hand rule just reverse the direction of the current.

 

[funky brat]

Do you people have any plan to get out of sticky situations in paper?

Yeah, write your favourite song lyrics.

 

[princess Anu]

Can somebody explain the working of bimetallic strip