here:)
oops i did the wrong question(4b)
2b(i)
yes you can write that the numbers are close enough, only 0.03 ohm difference between doubled resistance of circuit 1 and circuit 2.
2(b)(ii)
-repeats
-switch circuit off between readings.
1(b)
Find center using 2 blocks on the sideslike this --->
|()|
then extend it so that the diameter is seen, put half of the cylinder to make sure the marks match and than push it farther in.(you can draw a diagram for all of this)