Theresistance per unit length of a piece of a copper wire with circular cross-section with diameterof 1.03 mm is 2.5 x 10-4Ω/cm. concentration of free electrons is 8.4 x 1028/m3. The current densityis 2.1 x 106A/m2(Assume that the free hole concentration equal zero).

Afixed electric space heater wired by a cable with an ampacity of 30 a should draw a maximum current of a. 30 a. b. 24 a. c. 15 a. d. 27 a.

Asmall, positively charged ball is moved close to a large, positively charged ball. which describes how the small ball likely responds when it is released? it will move toward the large ball because like charges repel. it will move toward the large ball because like charges attract. it will move away from the large ball because like charges repel. it will move away from the large ball because like charges attract.

*drag each tile to the correct location in the sequence* the table shows chronological events in the life of our sun, a medium-sized star. place the missing events into the correct rows of the table.