The hubble telescope’s orbit is 5.6 × 10^5 meters
above earth’s surface. the telescope has a mass
of 1.1 × 10^4 kilograms. earth exerts a gravitational
force of 9.1 × 10^4 newtons on the telescope. the
magnitude of earth’s gravitational field strength
at this location is
(1) 1.5 × 10^−20 n/kg (3) 8.3 n/kg
(2) 0.12 n/kg (4) 9.8 n/kg

the answer is to check all of them! they all apply well at least i think so!

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.