The correct option is A 0.08
Given:
Energy, E=2×106 kWh
1 kWh=3.6×106 J
⟹E=2×106×3.6×106 J
⟹E=7.2×1012 J
According to Einstein's mass-energy equivalence, the lost mass Δm can be converted into equivalent energy by the relation:
E=Δm c2, where c=3×108 m s−1 is the speed of light in vacuum.
Hence,
Δm=Ec2=7.2×1012(3×108)2
=7.2×10129×1016
⟹Δm=0.8×10−4 kg
⟹Δm=0.8×10−4×103 g
⟹Δm=0.8×10−1 g=0.08 g