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evtldocha
1 year ago

However, in this task (32a) only r2 was calculated… Why?

Just look. In the length of the wire there is also a π because the length l results from the number of turns and the circumference of the plastic coil.

In the end, this π in the length calculation with the π from the cross-sectional area calculation.

Confirm me again in my view, first write all formulas, to write into a final formula and to use numbers at the end (I have not whether the result is correct, but the numerical value of the specific resistance ρ has already been misused in the solution — 0.0017 vs. 0.017 )