How does adding an iron bar to a solenoid affect the magnetic field of the electromagnet?
1)it changes the magnetic field to a current.
2)it changes the magnetic field’s direction.
3)it increases the magnetic field’s strength.
4)it decreases the magnetic field’s strength.

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.

If jason ii needs 15 kw of power at 300 volts to operate, what amperage of current must flow through the cable?