Biology; Chemistry; Physics: Post your doubts here!

[Faizan Muhammmad]

But a BULB is in the circuit too. Will it still be the EMF?

I think so

 

[Dark Destination]

I think so

10 Bulbs. Still EMF?

 

[M.Omar]

But a BULB is in the circuit too. Will it still be the EMF?

really close since the voltmeter voltage is really high relative to the bulb..Apply the voltage fraction formual in series and u will find tht p.d of voltmeter is wud be really close to e.m.f even with a lamp

 

[M.Omar]

10 Bulbs. Still EMF?

Depends upon the relative resistance and how gr8 the resistance difference is

 

[Dark Destination]

really close since the voltmeter voltage is really high relative to the bulb..Apply the voltage fraction formual in series and u will find tht p.d of voltmeter is wud be really close to e.m.f even with a lamp

So you are saying the voltmeter itself has a potential difference
And the voltage of the voltmeter is the reading of the voltmeter.. which is very close to the EMF of the cell?

 

[FLRNAB]

Yup it does show the force required to have resultant moment zero..To further complement ur statement if the newton meter were to be exactly below the line of weight of tht block it wud cancel it,s weight as well and then (even including the block) the force wud be 1.2
U r also right when u say if we remove the weight the pivot exerts 1.2N coz it wud then have to cancel only weight of ruler

So you/I am/are saying that Newton Meter exerts no force. But then Moment of any force applied at 0 distance to pivot will be zero so whatever the pivot applies on the ruler it won't balance it?

 

[Laibaaa]

Can someone explain it to my why the answer is C and not D :/

 

[FLRNAB]

So you are saying the voltmeter itself has a potential difference
And the voltage of the voltmeter is the reading of the voltmeter.. which is very close to the EMF of the cell?

V1 = Voltage before Voltmeter
V2 = Voltage after Voltmeter

PD = V1-V2

V1 = EMF
V2 = Almost Zero.

 

[Faizan Muhammmad]

Oh god
it is pretty simple actually
If you practically put a voltmeter in series it blows up unless the cell emf is quite small
otherwise it is safe to say that the reading will be pretty large

 

[Dark Destination]

V1 = Voltage before Voltmeter
V2 = Voltage after Voltmeter

PD = V1-V2

Which circuit are you talking about? :/

 

[Dark Destination]

Oh god
it is pretty simple actually
If you practically put a voltmeter in series it blows up unless the cell emf is quite small
otherwise it is safe to say that the reading will be pretty large

Who said it blows?

Why does it blow? :/

 

[FLRNAB]

Which circuit are you talking about? :/

Is there any other circuit?

 

[FLRNAB]

Oh god
it is pretty simple actually
If you practically put a voltmeter in series it blows up unless the cell emf is quite small
otherwise it is safe to say that the reading will be pretty large

No it does not blow. You must have a china one with C4 inside.

 

[Dark Destination]

Can someone explain it to my why the answer is C and not D :/

C seems more suitable.

And also, if you're thinking D is Hydrogen, it only forms X, and not X2.. that means its not in the non-metal state yet.

 

[Dark Destination]

Okay, simple question.
What is Voltage? Is potential difference and voltage same thing?

 

[Faizan Muhammmad]

Who said it blows?

Why does it blow? :/

Who said it blows?

Why does it blow? :/

I think I blew one in science lab, I know

 

[FLRNAB]

Can someone explain it to my why the answer is C and not D :/

D says non-metal and non-metals form negative ions so they can't be in positive ion state.
They can't lose electrons only gain them. To form positive ions they must have lost an electron which does not happen.

 

[Dark Destination]

I think I blew one in science lab, I know

Fazool Voltmeter hoga

 

[Faizan Muhammmad]

No it does not blow. You must have a china one with C4 inside.

that would be peshawri man

 

[M.Omar]

So you/I am/are saying that Newton Meter exerts no force. But then Moment of any force applied at 0 distance to pivot will be zero so whatever the pivot applies on the ruler it won't balance it?

The pivot does not balance the ruler,the moment provided by newton meter equalizes the other moment.Of course the meter exerts a foce but tht force only creates an opposing moment and dose not cancel the weight force of the object as it is not in line with weight..Like I said earlier if it were to be exactly below (i.e in dirct line witht he weight OF THE BLOCK) then it WUD cancel the weight of the block and picvot wud exert 1.2 N coz it needs to oppose weight of scale alone