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  1. S

    Physics: Post your doubts here!

    Woops Sorry, I didnt see Number 15 in there :P Thanks for solving that :)
  2. S

    Physics: Post your doubts here!

    Question 31:- The direction of the field lies represent the direction of the force acting on a POSITIVE test charge from its defiition. Therefore, the force on a proton at any point is tangential to the field line. If its an electron, then just flip the arrow 180 Degrees. So the answer is A
  3. S

    Physics: Post your doubts here!

    Question 10:- When sand is added, the mass increases. Therefore, its speed decreases since energy is nor created nor destroyed so k.e=0.5mv^2 has to be constant When it is removed, some k.e is lost when it is dropeed out. Therefore, k.e decreases when its mass is less. Its speed will remain...
  4. S

    Physics: Post your doubts here!

    Proportionality formulas I used Young's Modulus where it is equals Stress/Strain= (F/A)/(x/L) so F = xY(A)/L so F is proportional to A and inversely proportional to L. So if l doubles , F halves. If Area doubles, F doubles You dont need to learn the derivation i showed you. This is just to...
  5. S

    Physics: Post your doubts here!

    Question 20:- Tension in P:- is :"T" Tension in Q: - 2l means it is easier to pull so there is less tension ---> 1/2T A/2 means its is thinner so its also easier to pull ------> 1/2T/2 = 1/4T Therefore:- T/1/4T = 4/1 i.e D! Hope it helped :) Feel free to post more doubts
  6. S

    Physics: Post your doubts here!

    Question 18:- Your reasoning for question 18 is wrong :S The change in pressure is denstiy (rho) x gravity (g) x DIFFERENCE IN HEIGHT (delta h) If it increase by "h" on one side, it should go down by "h" on the other side so the change in height is 2h. Therefore, the pressure is 2hdg. i.e D
  7. S

    Physics: Post your doubts here!

    I just wanted to point out, Magnetic Flux is the number of magnetic field lines which is Phi. Magnetic Flux Linkage is the product of the magnetic flux and the number of turns of the coil. which is N x Phi. "Magnetic flux density is no. of field lines per unit area (Symbol:B )" like you said...
  8. S

    Cambridge International AS and A level Physics Coursebook

    We need the End of Chapter Question Answers and the Exam Chapter Question Answers!!! THANKS AGAIN!
  9. S

    Cambridge International AS and A level Physics Coursebook

    Yes pleaseee someon upload all the answers!!! I need 17 and above!! Thanks in advance!
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