A battery of 10 cells each of e.m.f. E=1.5V and internal resistance `0.5Omega` has 1 cell wrongly connected. It is being charged by 220V power supply with an external resistance of `47Omega` in series. The potential difference across the battery.

Answer

(B)

Explanation

Velocity of air molecule after collision `=2v`. The number of air-molecules accelerated to a velocity 2v in time `Deltat` is propotional to `AvDeltat`. Therefore `F=(Deltap)/(Deltat) prop(AvDeltat)((2v)/(Deltat))rArrFprop2Av^(2)`