9. Rdzeń elektromagnesu budujemy z:                                                                                          (10 p.) :D A. miedzi,                   B. cyny,                      C. żelaza,                    D. srebra.

9. Rdzeń elektromagnesu budujemy z:                                                                                          (10 p.) :D A. miedzi,                   B. cyny,                      C. żelaza,                    D. srebra.