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Here..could you tell me how to solve question 3)(c) in the november 2010 physics paper 61
link :- http://www.xtremepapers.me/CIE/Cambridge IGCSE/0625 - Physics/0625_w10_qp_61.pdf
also june 2011 question 1 (c)
link: http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s11_qp_61.pdf
thanks in advance.
3c: It says that the current will be 0.5I0, which means0.5*I0( Io=0.3(frm part a))
so 0.5*0.3=0.15
now Look for this value in the table and get the corresponding value for 'R'
R=10.1
Then it says the total resistance(10.1) is twice of the resistor X
so 1o.1 +x=2x
10.1=2x-x
10.1=x
1c: U need to write about Parallax error i.e the line of eyesight should be perpendicular to the card..