A cotton wick acts like a bundle of fine tubes. In one such tube of radius $0.20\ \text{mm}$, dipping into lamp kerosene (surface tension $0.025\ \text{N/m}$, density $800\ \text{kg/m}^3$, angle of contact $0^\circ$), how far up does the kerosene climb? ($g = 9.8\ \text{m/s}^2$.)