#include <iostream>
#include "algorithm"
#include "cmath"
using namespace std;
int main() {

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    
    int tt;
    cin >> tt;
   
    
    while (tt--) {
        long long  size;
        cin >> size;
        long long arrw[size];
        long long arrc[size];
        for (int i = 0; i < size; i++) {
            cin >> arrw[i];
        }
        for (int j = 0; j <  size; j++) {
            cin >> arrc[j];
        }
        int max = 0;
        for (int k = 0; k < size; k++) {
            if (max > arrw[k] - arrc[k]) {
                max = arrw[k] - arrc[k];
            }
        }
        cout << abs(max) << endl;
    }
 
  
}