Question

Three long wires with identical current either directly or indirectly out of the page are placed at the three corners of a square in four different arrangements. Correct order of the magnitude of net magnetic field at the empty upper right corner of the square is ?

Answer 1

Explanation:

Cross symbol representa the magnetic field is inside the plane of paper, whereas , the Dot sign represents that the magnetic field is outside the plane of paper.

thus, if we consider the above figures. and take each symbol = 1Tesla

Figure-1 = 3 x magnetic field inside + 0 x magnetic field outside

Figure-2 = 2 x magnetic field inside + 1 x magnetic field outside

Figure -3 = 1 x magnetic field inside + 2 x magnetic field outside

Figure -4 =0 x magnetic field inside + 3 x magnetic field outside

since all are of same magnitude , thus,

B1 = 3T

B2=2T

B3=2T

B4= 3T

.

thus, the answer is,

B1=B4 > B2=B3