An infinitesimal element dl = dzk is located at the origin (x, y, z) = (0, 0, 0) with a current I flowing along the direction of dl. What is the infinitesimal magnetic field dB at point (-1,1,1) due to this element? Ho Idz а. (i + j) 4Tt 3 Ho Idz b. 4t 33/2 (i + j) 0. (-i - i) Ho Idz с. 4Tt 3 Ho Idz d. (-i - ) ,3/2 4TT 3° 33/2 a.
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