Supposing the copper strip is 23 cm long, we can also measure the ohmic voltage drop across the strip along the direction of the current flow. This potential difference is typically much larger than the Hall voltage. What value of B (in T) will make the Hall voltage equal to 10% of the voltage drop along the length of the copper strip? (Calculate your answer using the same copper strip discussed in the Example.) Hint B = 257.6 X Set the voltage difference in one equation equal to the specified fraction of the voltage difference in the other equation. Solve to find the required value of B. T