An electrolysis deposits metal at a steady rate. If both the current and the running time are doubled, by what factor does the deposited mass grow?

Core Concept

Faraday's law makes deposited mass proportional to total charge passed, m proportional to I × t. Doubling the current doubles the charge, and doubling the time doubles it again, compounding to fourfold charge and fourfold mass. Doubling either variable alone would give a factor of 2; doing both multiplies the effects.