c)as speed changes, wavelength and frequency change.
the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it
find the surface area of the sphere to the nearest square unit. use a calculator.
a. 254 in.2
b. 64 in.2
c. 127 in.2
d. 1,018 in.2