Yea but whats the concept behind it? aren't primary current and primary emf in phase?
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A2 Physics | Post your doubts here
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Yea but whats the concept behind it? aren't primary current and primary emf in phase?
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http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s06_qp_4.pdf Q4 C..how do we figure out which positions..plz help!
no they are 90 degree out of phase......only current and flux are in phase
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To find mean voltage, you need the sum of all the voltage under the sinusoidal graph, which is composed of peaks and valleys. Now if you add the areas under the (+) peak and the area above the (-) valley, the sum is zero. Through Mean=Sum of X/No. of X , whatever the number of X may be, the mean is zero is the sum of X is zero. So the mean voltage in AC is zero unless you remove the effect of direction by squaring.
that means you haven't got the concept yet.
gravitational potential is work done in bringing unit mass from infinity to the point, meaning that you are not considering the mass that you are moving.
Besides, the mass of object is NOT given.. so no choice but to use mass of earth.
just remember the situation it works for all question
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Why are you complicating the problem.
Work done is P x Delta V.
If it asks for change in K.e then you can use 3/2 Pv = 3/2 (NkT)
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-got anything about our Am bandwidth confusion?
-do we include the sign of the charges while calculating electric potential?
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- I posted the image from a book, did you see that ? Apart frm that i did not get anything else
-No, we dont
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does a dc voltage vary in magnitude? because it has a max value and r.m.s value?
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http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s04_qp_4.pdf
Have a look at q6
See the mark scheme
http://www.xtremepapers.com/papers/...A and AS Level/Physics (9702)/9702_s04_ms.pdf
Im really confused!
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MARKING SCHEME SAYS :for gravitational, work got out as masses come together
/mass moves from infinity
for electric, work done on charges if same sign, work got out if opposite sign as charges
come together
what on earth does work got out mean?
/mass moves from infinity
for electric, work done on charges if same sign, work got out if opposite sign as charges
come together
what on earth does work got out mean?
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No, it does not vary
It has no r.m.s value
R.m.s value is the feature of a.c current
R.m.s value of a.c current is the value equaivalent to the d.c current value which produces the same power dissipation in a resistor
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It means work is done by the masses
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for example j10 41 Q6 , it says dc voltage of peak value of 9 Volts, this means it has an r.m.s value?
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thanks
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in that case u know, a varying output will be produced...
like the last one - the orange part...
so peak value is given
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1) ideal gas compressed, means work done on it i.e increases, and they come closer togetherhttp://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s04_qp_4.pdf
Have a look at q6
See the mark scheme
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s04_ms.pdf
Im really confused!
Constant temperature means Internal energy is constant, so q must decrease.
2)heating of solid ---> thermal energy input / no expansion no work done.
3)melting of ice, thermal energy required to break bonds, no change in volume against atmosphere/ very small.
R.m.s value for ac current and for ac voltage, is therre a difference in definition.
Is it better to say equivalent to d.c current or do we say it is a steady constant value for current.