http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_11.pdf
Guys please question 5 COMPLETE EXPLANATion !!!
Thank u
for finding the largest effect we have to find the percentage uncertainty in each of the variables.
percentage uncertainty in F =(0.01/19.62)*100 =0.05097%
percentage uncertainty in l = (0.002/2.043)*100 =0.0979%
percentage uncertainty in d = 2(0.02/0.54)*100 = 7.41%
percentage uncertainty in x =(0.2/5.2)*100 =3.85%
"d" has the largest effect on the uncertainty in the value of the calculated
Young modulus because it has the highest percentage uncertainty
therefore answer in B