Mathematical and Physical Journal
for High Schools
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# Problem P. 4758. (October 2015)

P. 4758. A piece of wire is to be used to make an immersion heater rated at 230 V, and 300 W. What should the length of the wire be, if the cross section of the wire is $\displaystyle 0.1~{\rm mm}^2$, and its resistivity is $\displaystyle 1.6~\Omega\;{\rm mm}^2/{\rm m}$?

(3 pont)

Deadline expired on November 10, 2015.

### Statistics:

 151 students sent a solution. 3 points: 130 students. 2 points: 10 students. 1 point: 9 students. Unfair, not evaluated: 2 solutions.

Problems in Physics of KöMaL, October 2015