Which of the following expressions gives the magnitude of the gravitational field at…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Which of the following expressions gives the magnitude of the gravitational field

g(h)

at an altitude

h

above Earth’s surface in terms of the surface value

g_0

and Earth’s radius

R_E

? (a)

g(h)=g_0\left(1-\dfrac{2h}{R_E}\right)

(b)

g(h)=\dfrac{g_0}{1+h/R_E}

(c)

g(h)=\dfrac{g_0}{(1+h/R_E)^2}

(d)

g(h)=g_0(1+h/R_E)^2