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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 points)

Deadline expired on 10 November 2015.

Statistics on problem P. 4758.
 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

•  Támogatóink: Morgan Stanley