/*
1.2
B的值为 0.00144186
6.98
B的值为 0.000830774
-2.3
B的值为 0.00136702
q
Press any key to continue
*/
#include
#include
using namespace std;
int main() {
double n = 400,R = 105,I = 60;
double u = 4 * 3.1415926*pow(10,-7);
double x,B;
while(cin >> x) {
B = (u * n * I * R) / (2.0 * pow((R + x * x), 3.0/2));
cout << "B的值为 " << B << endl;
}
getchar();
return 0;
}
这个公式叫啥?