Answer:
If an infinite line of current located on the z-axis has a cylindrically symmetric H field of H0a (a is the unit vector in the direction) at r = a, find:
a H at r=a
Explanation:
because ji cylindrical symmetry h field o** a is the unit of vector in the direction and at r is equal to a find the h o a is a the unit of after a dash and r a the answer will r a because the unit of direction will be connected on
