question_answer

A small current element of length \[d\ell \]and carrying current is placed at (1, 1, 0) and is carrying current in \['+z'\] direction. If magnetic field at origin be B\[{{\vec{B}}_{1}}\] and at point (2, 2, 0) be \[{{\vec{B}}_{2}}\] then:

A) \[{{\vec{B}}_{1}}={{\vec{B}}_{2}}\]

B) \[\left. \left| {{{\vec{B}}}_{1}} \right. \right|=\left| 2\left. {{{\vec{B}}}_{2}} \right| \right.\]

C) \[{{\vec{B}}_{1}}=-{{\vec{B}}_{2}}\]

D) \[{{\vec{B}}_{1}}=-\,2{{\vec{B}}_{2}}\]