Which of the following will increase the strength of a copper electromagnet?
Check all that apply.

amber has allowed scientists to study dna that has been preserved over millions of years.

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.

the actual answer was 160934