Question

$B_X$ and $B_Y$ are the magnetic field at the centre of two coils of two coils $X$ and $Y$ respectively, each carrying equal current If coil $X$ has $200$ turns and $20\, cm$ radius and coil $Y$ has $400$ turns and $20 \,cm$ radius, the ratio of $B_X$ and $B_Y$ is

• A. $1: 1$
• B. $1: 2$
• C. $2: 1$
• D. $4: 1$

Answer 1

Answer: (B)

$1: 2$

Answer 2

Therefore, the correct option is (B): 1 : 2