Question

Magnetic field due to a current carrying loop or a coil at a distant axial point P is B₁ and at an equal distance in it's plane is B₂ then $\frac { B _ { 1 } } { B _ { 2 } }$ is

• A. 2
• B. 1
• C. 1/2
• D. None of these

Answer 1

Answer: (A)

2

Answer 2

Current carrying coil behaves as a bar magnet as shown in figure.

We also knows for a bar magnet, if axial and equatorial distance are same then $B _ { a } = 2 B _ { e }$

Hence, in this equation $\frac { B _ { 1 } } { B _ { 2 } } = \frac { 2 } { 1 }$