Physics, Chemistry and Biology: Post your doubts here!

[gary221]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w12_qp_32.pdf
Q11 plz sme1

11 a)

b i) Diodes allow current to flow only in one direction. This diode will allow current to flow only from A to B (according to how it's placed), ie. current will flow only if A is at a higher potential than B. Since that is the case here. A = 6V, B = 0V, there will be a deflection.
ii) No deflection.

c)

 

[gary221]

They don't reply to pms

Yeah, but the imp. thing is they get the message.

 

[gary221]

View attachment 43060

HELP PART (b) PLZ

Post the paper link..

 

[R_Ma7mooD]

Guys why red color can be seen from further distances than other colors, regarding its wavelength?

 

[silver_moon]

My friend, is it written or implied there?
This refers to all forms of cheating. Do you even know what happens when you cheat? It proves you as a lethargic person always reluctant to do things the right way. You are willing to take the short-cuts to everything by doing the wrong things. This is not taught to you in Islam. Islam stresses you to struggle and strive for your goal, and in the end, Allah Is There to Reward you

SalmanPakRocks
Nibz
CaptainDanger

Please do take decisive action against all those involved in cheating

forget it..dt guy iz cheatin on himself..by doin dis!hes d ultimate loser!!

 

[gary221]

Guys why red color can be seen from further distances than other colors, regarding its wavelength?

I think it's to do with the scattering of light.. Since red light has a longer wavelength, it is less scattered, and can be seen from a greater distance.

 

[silver_moon]

not actually all d lesson cuz there is general physics and thermal physics ... my question is about the magnetic effect of a current and about potential divider.the right hand rule and left hand rule. Is it important to know the logic gates ? if so why.

yes ..u shud kno all kind ov logic gates:AND,OR,NOR,NOT.NAND!dts all-kno 2 drw dm coz dy smtime ask u 2 drw...n kno when in each gate the outputs will b high or low its very important..dont neglect it..go 2ru d rev.guide if u wnt..

 

[R_Ma7mooD]

I think it's to do with the scattering of light.. Since red light has a longer wavelength, it is less scattered, and can be seen from a greater distance.

oh okay, thanx bro

27 A piece of iron and a piece of steel are picked up by an electromagnet as shown.

N S
steel iron

The current to the electromagnet is switched off.

What happens?
A. Both the iron and the steel remain magnetised.
B. Neither the iron nor the steel remain magnetised.
C. Only the iron remains magnetised.
D. Only the steel remains magnetised.

and why?

 

[Gamedos]

oh okay, thanx bro

27 A piece of iron and a piece of steel are picked up by an electromagnet as shown.

N S
steel iron

The current to the electromagnet is switched off.

What happens?
A. Both the iron and the steel remain magnetised.
B. Neither the iron nor the steel remain magnetised.
C. Only the iron remains magnetised.
D. Only the steel remains magnetised.

and why?

D
steel became a permanent magnet
iron cannot become a permanent magnet

 

[R_Ma7mooD]

D
steel became a permanent magnet
iron cannot become a permanent magnet

but isn't it that most permanent magnets are made from iron? and steel contains iron too.

 

[silver_moon]

state what is meant by linearity as it applies to the thermometer??

linearity is the scale on the thermometer with equal divisions on it.

 

[Gamedos]

but isn't it that most permanent magnets are made from iron? and steel contains iron too.

no
iron is a soft magnetic material ---->magnetised easily but it is a temporary magnet that is y it is used in electromagnets
steel is a hard magnetic material---->magnetised hardly but it is a permanent magnet

 

[R_Ma7mooD]

no
iron is a soft magnetic material ---->magnetised easily but it is a temporary magnet that is y it is used in electromagnets
steel is a hard magnetic material---->magnetised hardly but it is a permanent magnet

oh okay now I get it, Thanks bro

 

[Gamedos]

linearity is the scale on the thermometer with equal divisions on it.

that is a linear SCALE
there is linear scale----->the thermometer with equal divisions on it
and linear liquid------->expands equally with same changes in temperature

 

[silver_moon]

but isn't it that most permanent magnets are made from iron? and steel contains iron too.

rong bro..iron and steel are ferrous bt iron iz nly temporary magnet n steel iz permanent magnet

 

[silver_moon]

that is a linear SCALE
there is linear scale----->the thermometer with equal divisions on it
and linear liquid------->expands equally with same changes in temperature

true...bt u do get mrks fr what iv tol coz its not mentioned "linearity liquid"

 

[Bilal ashraf]

Please help!
How much energy is converted in a resistor of 5 ohms carrying a current of 2 A for 10 s
A : 4j
b : 25j
c : 100j
d : 200j

 

[Mr.Physics]

Anyone neeeds help. If so, then i can

 

[Mr.Physics]

Please help!
How much energy is converted in a resistor of 5 ohms carrying a current of 2 A for 10 s
A : 4j
b : 25j
c : 100j
d : 200j

R=5 ohm
I=2A

So find V
V=IR=2x5=10V

Now E=P x t
E =IxVxt
E=2x10x5=100J

The answer is C !!!!

 

[Bilal ashraf]

Thanks!!