Physics, Chemistry and Biology: Post your doubts here!

[ZaqZainab]

Hello everyone, I have an urgent question. So I saw similar questions in many past papers now. How do you solves these kinds of questions, step-by-step:

Q3(a) http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s03_qp_3.pdf

 

[AlphaWolf]

Thank you so much, So these are just vector addition?

 

[ManalMansoor]

Hi! Please help me with Physics paper 3. Question number 2 (b) October november 2007
I don't get it? :S

 

[Faaiz Haque]

Need help question 1 A iii
http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Physics%20(0625)/0625_w10_qp_33.pdf
Thanks

 

[Iridescent]

For Question 2) isn't it 50 seconds

Depends upon the question. It's an old post so I don't really remember the question. Do check the question and let me know, i'll change it.

 

[GorgeousEyes]

Please can u tell me all about Fleming right and left hand rule , and right grip rule ?

 

[Princess Raven]

guys when exactly do we use the left hand rule.. and when do we use the right???

 

[Iridescent]

guys when exactly do we use the left hand rule.. and when do we use the right???

Left hand rule: When current causes motion e.g in a motor.
Right hand rule: When motion causes current e.g in a generator.

 

[GorgeousEyes]

JUN012 V.31 NO.9 b)iii PLEAAASE

 

[Princess Raven]

Left hand rule: When current causes motion e.g in a motor.
Right hand rule: When motion causes current e.g in a generator.

ok so in S 12 V 31 Q 10 A... Y DID THEY USE THE LEFT HAND RULE???????????? isnt it suppose to be the right hand?

 

[Princess Raven]

JUN012 V.31 NO.9 b)iii PLEAAASE

1st u find the % increase which is 8.4, this is the resistance of each lamp
Then u find R total 240/0.9= 266.7
To find the no. 266.7/8.4= 32 is the number of lamps that r working
40-32=8 lamps that fail

 

[Iridescent]

ok so in S 12 V 31 Q 10 A... Y DID THEY USE THE LEFT HAND RULE???????????? isnt it suppose to be the right hand?

Of course not. There is magnetic field and there is current in the wire. That current is causing the motion so it has to be Left hand rule.

 

[ZaqZainab]

Please can u tell me all about Fleming right and left hand rule , and right grip rule ?

Fleming's Left Hand Rule the direction of the force, for electric motors (Dc)
Fleming's Right Hand Rule the current by the force,for electric generators (AC)
Right Grip Rule- Direction of the Magnetic field when Direction of current is given,for current carrying conductors
Thank God Fleming stooped making rules or there would be a left foot rule or a right foot rule well right grip was not by Fleming no wonder it is easier to use

 

[Princess Raven]

so

Of course not. There is magnetic field and there is current in the wire. That current is causing the motion so it has to be Left hand rule.

whenever its into or out of the page we always do the left hand rule?

 

[GorgeousEyes]

1st u find the % increase which is 8.4, this is the resistance of each lamp
Then u find R total 240/0.9= 266.7
To find the no. 266.7/8.4= 32 is the number of lamps that r working
40-32=8 lamps that fail

I don't think that the same exam , Thank u anw , I want june012 v.31 no.9 iii

 

[GorgeousEyes]

Fleming's Left Hand Rule the direction of the force, for electric motors (Dc)
Fleming's Right Hand Rule the current by the force,for electric generators (AC)
Right Grip Rule- Direction of the Magnetic field when Direction of current is given,for current carrying conductors
Thank God Fleming stooped making rules or there would be a left foot rule or a right foot rule well right grip was not by Fleming no wonder it is easier to use

Thanks very much , but could u tell me please the thumb and the first and second finger usage . I am really confuse

 

[Princess Raven]

I don't think that the same exam , Thank u anw , I want june012 v.31 no.9 iii

lol sorry..

 

[GorgeousEyes]

lol sorry..

No problem , Thanks hun if u have time could u see the one i am asking abwt ?

 

[Princess Raven]

I don't think that the same exam , Thank u anw , I want june012 v.31 no.9 iii

ok for this u just do 6v-2.4= 3.6v
then I4= 1.2+0.8= 2
r= 3.6/2
= 1.8ohms

 

[himanshu dave]

could u help me out wid the whole menstrual cycle including the hormones LH and FSH this part just dosent get into my mind