Research is underway to generate electrical energy by fusing hydrogen nuclei. Which row identifies two of the difficulties involved in designing a fusion reactor?
- Atemperature needed: very low; why obtaining a high density of hydrogen nuclei is difficult: the nuclei are negatively charged and repel each other
- Btemperature needed: very low; why obtaining a high density of hydrogen nuclei is difficult: the nuclei are positively charged and repel each other
- Ctemperature needed: very high; why obtaining a high density of hydrogen nuclei is difficult: the nuclei are negatively charged and repel each other
- Dtemperature needed: very high; why obtaining a high density of hydrogen nuclei is difficult: the nuclei are positively charged and repel each other