1. The problem statement, all variables and given/known data A strip of doped silicon 270 µm wide contains 9.1E22 conduction electrons per cubic meter and an insignificant number of holes. When the strip carries a current of 110 µA, the drift speed of the electrons is 44 cm/s. What is the thickness of the strip? 2. Relevant equations I=n*e*A*V Where I is current, n is electrons per volume, A is cross sectional, v is drift velocity 3. The attempt at a solution I've plugged into the equation above the variables given in the problem and solved for area. But how to find thickness, given the width? I think there's a missing link somewhere.