Magnetic Effects of Current / करंट का चुंबकीय प्रभाव
JEE Main & Advanced
Physics
Magnetic Effects of Current / करंट का चुंबकीय प्रभाव
Question Bank
Biot-savart's Law and Amperes Law
question_answer
Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is [Kerala PET 2002; DCE 2002]
A) \[{{\mu }_{o}}i/r\]
B) \[4{{\mu }_{o}}i/r\]
C) Zero
D) \[{{\mu }_{o}}i/4r\]
Correct Answer:
C
Solution :
At P \[\Rightarrow {{B}_{net}}={{B}_{1}}-{{B}_{2}}\] Since \[\left| {{B}_{1}} \right|=\left| {{B}_{2}} \right|\] So, Bnet = 0