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  1. Suchal Riaz

    -For everyone who gave Pakistan Studies and Islamiyat last year!

    read all books available to you but the David one is good because it contains straight-forward facts but the elaboration is good. elaboration is the most important part in a question.if you fill up the answers with facts you will get high marks but for A* standard marks you need to elaborate and...
  2. Suchal Riaz

    Physics: Post your doubts here!

    27- U of three blocks increase as their heights are increased by 1h, 2h and 3h. so total change will be 6mgh
  3. Suchal Riaz

    Physics: Post your doubts here!

    Q 21 power = work done/sec = IV = 200*6000 = 1200000 W change in Potential energy/sec = mgh/sec =(m/sec)*gh = 500KgS- * 9.81ms-2 * 300m = 1471500W efficiency = 1200000/1471500 = 81.5% D Q23 extension = F/k =W/k k of parallel springs add together: 2k springs in series add like resistors in...
  4. Suchal Riaz

    Physics: Post your doubts here!

    Q17 As the reading of gavanometer is zero so the pd across that part of wire = E2 as we know the length so we can find pd/length using E2/XT. we already know XT and only need E2. (there are many ways to calculate that but for other methods more than one readings are required) Q19 percentage...
  5. Suchal Riaz

    Physics: Post your doubts here!

    bothering
  6. Suchal Riaz

    Physics: Post your doubts here!

    was it practical paper or written paper? we did a practical paper (in AS) which was similar(involved strength of magnets) so i thought it would be similar. i thought it was practical paper and i didn't read it carefully. sorry.
  7. Suchal Riaz

    Physics: Post your doubts here!

    they would give you the apparatus so you will decide like that. if you send me the confidential instructions of that year i can tell you how it has to be done. ok?
  8. Suchal Riaz

    Physics: Post your doubts here!

    I am AS too :(
  9. Suchal Riaz

    Physics: Post your doubts here!

    forgive me i didn't sleep last night and i don't know what i am saying. i confused it with the question in which the distance was found for work done. I don't know why i multiplied distance. charge per point = Q, charge pass per round=4, round per second=f A=charge/time=charge.frequency while...
  10. Suchal Riaz

    Physics: Post your doubts here!

    Anzuman turin 28- if it is in equilibrium the moment must be zero. as we don't know the friction and contact forces at X take moments about it so the moment of reaction forces are zero. 10 is half the distance from X than Y so it's moment will be 10N X 0.5XY the perpendicular component of force...
  11. Suchal Riaz

    Physics: Post your doubts here!

    Anzuman turin 26- the circumference = distance travelled by one point charge in one round. frequency means rotation per second. there are four of the point charges. so total charge pass in one second will be 4 X (2πr) X Q X F=8πrQf
  12. Suchal Riaz

    Physics: Post your doubts here!

    20- take readings of current at zero volt and take the ratio 22- 0-6V because max volts of 20 volt resistor is 20*12v/(20+20) 24- the resultant is zero because the force on + and - is same and opposite so it will cancel out.. the forces on + and - would be equal and opposite so a torque of a...
  13. Suchal Riaz

    well said

    well said
  14. Suchal Riaz

    Physics: Post your doubts here!

    14- the direction of force would be opposite to the direction of field. one way to think about it is that as F=eV/L and e is negative the force will be in opposite direction. or you can think that the electric field shows the path taken by a unit positive charge so electron, having opposite...
  15. Suchal Riaz

    Physics: Post your doubts here!

    Please give me some time. tomorrow i have to go to college early so i will solve them for you when i come back.
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