you have two positively charged spheres. one sphere has 3 times the charge of the other sphere if they are 0.16m apart and the force between them is 0.28 N, what are the charges of the two spheres?

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above