Question

# The largest and the shortest distance of the earth from the sun is $$r_1$$ and $$r_2$$. Its distance from the sun when it is at perpendicular to the major axis of the orbit drawn from the sun:

A
(r1+r2)/4
B
(r1+r2)/(r1r2)
C
2r1r2/(r1+r2)
D
(r1+r2)/3

Solution

## The correct option is B $$\displaystyle 2r_1r_2/(r_1+r_2)$$Using the ellipse property is :$$2/R=1/r_1 + 1/r_2$$$$R=2r_1r_2/(r_1+r_2)$$Physics

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