JEE Physics · Hard

Gravitation: Hohmann Transfer Energy MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Hohmann Transfer EnergyHardQuestion 30749

Question

A spacecraft moves from circular orbit r₁ to r₂ (r₂ > r₁) via Hohmann transfer. Total energy change is:
  1. A
    −GMm(1/r₁ − 1/r₂)/2
  2. B
    GMm(1/r₁ − 1/r₂)/2
    Correct
  3. C
    −GMm/2r₁
  4. D
    GMm/r₂

Correct answer

GMm(1/r₁ − 1/r₂)/2

Explanation

E₁ = −GMm/2r₁. E₂ = −GMm/2r₂. ΔE = E₂−E₁ = −GMm/(2r₂) + GMm/(2r₁) = GMm(1/r₁−1/r₂)/2 > 0 (energy input needed for higher orbit).