Expected results are obtained and are in good agreement with those obtained by Peters, Jaffe and Delos [5],and in this respect, some comparisons with the case of parallel electric and magnetic fields are done.

• 我们得到了预期的结果，与Peters，Jaffe和Delos[5]得到的结果非常一致，并且与平行电磁场的情况作了比较。