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  1. Mobeen

    A2 Physics | Post your doubts here

    E is the rate of change of magnetic flux density. from T1 to T2 variation in B is constant i.e the gradient is constant . so a horizontal line is sketched . same goes for t2 to t3 but in opposite direction .. you simply have to sketch the gradient per unit time for the above graph .. get it ?
  2. Mobeen

    A2 Physics | Post your doubts here

    oh ok thanks ! but havnt seen any question regarding this , or is there?
  3. Mobeen

    A2 Physics | Post your doubts here

    for T1 to T2 there would be a horizontal line above the axis . and for T2 to T3 there would be a horizontal line below the axis . everywhere else would be at zero .
  4. Mobeen

    A2 Physics | Post your doubts here

    i dont know myself what stopping potential is :P
  5. Mobeen

    A2 Physics | Post your doubts here

    i was talking about the movement of a proton in a magnetic field cause she asked where the protons come in this rule .. i wasnt talking about emf
  6. Mobeen

    A2 Physics | Post your doubts here

    the left hand rule has got protons doesnt it ? the second finger shows the direction of the protons , alpha nucleus or whatever given
  7. Mobeen

    A2 Physics | Post your doubts here

    i guess she was just talking about the rules in general not any question ..
  8. Mobeen

    A2 Physics | Post your doubts here

    in the first line the question says that the needle travels a total distance of 22mm . amplitude is half the distance traveled in one cycle . = 22/2 = 11mm
  9. Mobeen

    A2 Physics | Post your doubts here

    im doing them from my sir's compiled booklet . he has removed all the questions which arnt in our sylabus now.
  10. Mobeen

    A2 Physics | Post your doubts here

    yeah but an old one . 1998 . did they ask about amplifiers bandwidth in any recent paper ?
  11. Mobeen

    A2 Physics | Post your doubts here

    actually i was just doing all the amplifier questions so thought i should know how to calculate the bandwidth . but you're probably right its too old .
  12. Mobeen

    A2 Physics | Post your doubts here

    err its june 1998 p3 Q9. you're right , half the things in the past papers arnt even in the textbooks ..
  13. Mobeen

    A2 Physics | Post your doubts here

    the question has an inverting amplifier with negative feedback and the question clearly asks "Calculate" the bandwidth of the amplifier.
  14. Mobeen

    A2 Physics | Post your doubts here

    oh cheer up ! its not the end of the world ! :)
  15. Mobeen

    A2 Physics | Post your doubts here

    where do you live ?? its not about studying the whole year or anything . i myself didnt study the whole friggin year(proof:failed my mocks) but EVERYONE starts studying the last month!
  16. Mobeen

    A2 Physics | Post your doubts here

    lolol either you're super intelligent and finished everything or you're plain old joking :P
  17. Mobeen

    A2 Physics | Post your doubts here

    how do you calculate the bandwidth of the amplifier ?
  18. Mobeen

    A2 Physics | Post your doubts here

    it means that the signal has the same sketching or shape of graph as the data e.g the voltage output would have the same variation with time(i.e the graph) as the input or whatever produced that voltage e.g sound .
  19. Mobeen

    A2 Physics | Post your doubts here

    yeah i did the same . and the gain in K.E would be equal to loss in P.E and we can find the speed by equating the K.E to 1/2mv^2 . Am i right?
  20. Mobeen

    A2 Physics | Post your doubts here

    only two values 1 and 0 . no intermediate value . no curve in the graph . a horizontal line at 1 or a horizontal line at 0
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