If the force of attraction between two unit masses (1 kg each) kept 1 km apart is taken as unit force and the unit of energy in this system is called ‘eluoj’ (joule written in reverse order) then the relation of ‘joule’ and ‘eluoj’ is [G = 6.67 × 10^–11 Nm² kg]^–2

(a) 1 eluoj = 6.67 × 10^–17 joule

(b) 1 eluoj = 6.67 × 10^–14 joule

(c) 1 eluoj = 10^–4 joule

(d) 1 eluoj = 6.67 × 10^–9 joule

(b)

        Let’s say force ‘notwen’ (newton written in reverse order) we know

        1 notwen = G  = G = 10⁶ notwen m²kg^–2

        But G = 6.67 × 10^–11 Nm²kg^–2

        \ 1 notwen = 6.67 × 10^–17 newton

        1 eluoj = 1 Nowten × 1 km = 6.67 × 10^–14 newton × 1 m

= 6.67 × 10^–14 Joule

(b) Let’s say force ‘notwen’ (newton written in reverse order) we know 1 notwen = G = G = 106 notwen m2kg–2 But G = 6.67 × 10–11 Nm2kg–2 \ 1 notwen = 6.67 × 10–17 newton 1 eluoj = 1 Nowten × 1 km = 6.67 × 10–14 newton × 1 m = 6.67 × 10–14 Joule