Which change would result in a stronger electromagnet?
A) using a smaller battery
B) using an iron nail with a larger diameter
C) changing the core to something made of aluminum
D) decreasing the number of wire coils around the nail

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?

What conclusion can be made based on the temperature of soil when the light hits the soil at 0°, 45°, and 90° angles in section 2 of the experiment? did your results support your hypothesis? why or why not?