Read Made-to-Order Magnets. Keep the article open throughout the assignment.
Select the statement that best summarizes the central idea of the article.
Electromagnets are useful in many situations because they can be turned on and off.
Motors change mechanical energy to electrical energy.
Electromagnets work whether or not electricity is passing through the wire.
Electromagnets are useful around the home but not in industry.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

amplitude

hope this

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m