Two long straight wires are set parallel to each other. Each carries a current; in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is
A) \[\frac{{{\mu }_{0i}}}{r}\]
B) \[\frac{4{{\mu }_{0i}}}{r}\]
C) zero
D) \[\frac{{{\mu }_{0i}}}{4r}\]
Correct Answer:
C
Solution :
The magnetic field at point\[P\] \[{{B}_{net}}={{B}_{1}}-{{B}_{2}}\] Since, \[|{{B}_{1}}|\,\,=\,\,|{{B}_{2}}|\] So, \[{{B}_{net}}=0(zero)\]