Question 82 of 276
As shown in the figure, two infinitely long, identical wires are bent by and placed in such a way that the segments and are along the - axis, while segments and are parallel to the - axis. If and the magnitude of the magnetic field at is and the two wires carry equal currents (see figure), the magnitude of the current in each wire and the direction of the magnetic field at will be
Show answer and solution
Answer: (A) perpendicular into the page
As we know that the magnetic field due to a infinite wire at a distance of d is given as
but there are two wires so that the net magnetic field is given as
but there are two wires so that the net magnetic field is given as
%2C%20the%20magnitude%20of%20the%20current%20in%20each%20wire%20and%20the%20direction%20of%20the%20magnetic%20field%20at%20O%20will%20be%20(%CE%BC%200%3D4%CF%80%20%C3%97%2010%5E-7NA%5E-2%20)%3A%20%3Cimg%20src%3D%22%2Fpractice%2Fpyq%2Fmagnetic-effects-of-current792365.png%22%3E%0A(A)%2020A%2C%20perpendicular%20into%20the%20page%0A(B)%2020A%2C%20perpendicular%20out%20of%20the%20page%0A(C)%2040A%2C%20perpendicualr%20into%20the%20page%0A(D)%2040A%2C%20perpendicular%20out%20of%20the%20page){kind=link}