Physics Paper 12 How was it

[Most_UniQue]

the currebt one was a tough one, you had to use velocity of electron formula I=navq...so since area and velocity are inversely proportional to each other, the speed will increase....and im confirmed on this...but i know 95% candidates did same speed ! ahahahhaha

Which option did u choose? I dont remember , I gues mine ws D:/

 

[MOMO123123]

nopex...option B was that the calculated value of Gwas accurate but the students reading were in accurate and not always up to the precisionof the timing device, all points were valid....option D lacked physics essence by saying " it can be considered successful"..it didnt give a justification of why!!!

yes exactly i chose that option.. i guess i chose B, but i thought i chose C.. but i remember choosing the option u just said, oh thank you and thank god ..

 

[Mattman]

but we dont know how precise is the stopwatch?

 

[MOMO123123]

but we dont know how precise is the stopwatch?

i think all stopwatches are to 0.01 seconds, but including the reaction time etc its 0.1? im not sure.. so the readings maybe precise but not always accurate due to the reaction time of the observer?

 

[xcalibur]

D was the option in the torque question.
What was the exact statement of the current wala q if someone remembers?

 

[Mattman]

the torque question was torque of a couple or torque about the pivot??

 

[ryabenz]

no it was C the decreasing line because this time they changed the question, they said plate seperation, but in the past years they said the distance of the particle from the plate.

r u sure they changed??? i cnt really rmbr a diffrnt version..but im not sure coz i was running out of time..anyone else, do u rmbr the electric field strength question??

 

[Ahmed Tariq]

yes, our sir taught it to us ...........so its gotta be..any ways i even searched on net and it was writtenthat wires with smaller cross section have greater drift velocity of electrons, the displacement one was the sine curve they gave, and we had to convert that velocity time graph to displacement time.

That was the half sine curve, wasn't it? When the velocity becomes 0, the displacement is maximum.

 

[MOMO123123]

r u sure they changed??? i cnt really rmbr a diffrnt version..but im not sure coz i was running out of time..anyone else, do u rmbr the electric field strength question??

it was moving from x to y, that means separation stays the same its definitely C, the constant E or F or whatever that was

 

[Ahmed Tariq]

it siad the cro detected a maximum then a minimum , then another maximum 33cm later, so distance between 2 antinodes was 33, therfore answer was B

Wasn't the answer D? I'm almost sure it was, the one with the wave having the smallest time period. 1 ms, I guess.

 

[ganapathynar]

The answer to the velocity of charge one is B, that is it stays constant because I = Q/t or rate of change of flow of electrons or speed of electrons, I has nothing to do with cross sectional area. CIE will never go into the complex formulas you guys are mentioning about this question!!!

 

[00tanveer]

wasn't asking that...anyways, I did that

 

[00tanveer]

torque of a couple

 

[Mattman]

torque of a couple

so whats ur answer?

 

[00tanveer]

what was the distance between the centro of mass and the pivot??

 

[Silent Hunter]

l/4 maybe

 

[good man12]

Wasn't the answer D? I'm almost sure it was, the one with the wave having the smallest time period. 1 ms, I guess.

first i also marked D, but when i rechecked i noticed 33cm was lambda/2, so lambda was 66cm, there fore the time period = .66/330 = 2ms...optionB

 

[good man12]

The answer to the velocity of charge one is B, that is it stays constant because I = Q/t or rate of change of flow of electrons or speed of electrons, I has nothing to do with cross sectional area. CIE will never go into the complex formulas you guys are mentioning about this question!!!

my brother had you studied that portion of the syllabus you would have ignored all options immediately and option D would have shone at you like the Sun.............as far as im concerned cambridge cant make option D wrong because it is the physically correct option, all the other options were physically and logically wrong, allow me to explain with some duagrams....: i hope my diagrams arent annoying anyone!!!!

 

[good man12]

my brother had you studied that portion of the syllabus you would have ignored all options immediately and option D would have shone at you like the Sun.............as far as im concerned cambridge cant make option D wrong because it is the physically correct option, all the other options were physically and logically wrong, allow me to explain with some duagrams....: i hope my diagrams arent annoying anyone!!!!

 

[Saad Sarfraz]

i really think its D, number of collisions per second increases.. cz its the only one that makes sense, velocity does increase because they gain ke, mean seperation does increases because pressure remains constant so volume must increase.. and i dont remember option B, but D was the only one that made sense not to be correct

Sorry bro but its C the distance between collisions increases...