At what height from the surface of earth the gravitation potential and the value of g are -5.4×10^7\ J kg^-2 and 6.0\ ms^-2 respectively ? Take the radius of earth as 6400 km :

1. 2600 km

2. 1600 km

3. 1400 km

4. 2000 km

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 1 Practice test neet Save WhatsApp Report

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Best answer

Answer: 1. 2600 km

Key idea: \(V=-\dfrac{GM}{r}\) and \(g=\dfrac{GM}{r^2}\), so \(r=\dfrac{|V|}{g}\).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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