Practice question

Excess pressure in a bubble: ΔP = 4Sr. S = 0.028N/m, r = 7×10−3m. ΔP = 4×0.0287×10−3 = 16Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 16 Pa. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.