A circular coil of radius r carries current I. If another circular coil of radius 2r carries the same current, then the ratio of the magnetic fields at the centers of the circular is

Q. A circular coil A of radius r carries current i. Another circular coil B of radius 2r carries current of i. The magnetic fields at the centres of the circular coils are in the ratio of

Q. The magnetic field at the center of a circular coil of radius r carrying current is $B_1$. The field at the center of another coil of radius $\frac{r}{2}$ carrying same current is $B_2$ then ratio of $B_1/B_2$ is :-

Q. A circular coil A has a radius $R$ and the current flowing through it is $I$. Another circular coil B has a radius $2R$ and the current flowing through it is $2I$, then the magnetic fields at the centre of the circular coils are in the ratio of :
(i.e. $B_1$to $B_2$)

Q. In a circular coil (1) of radius $R$, current $I$ is flowing and in another coil (2) of radius $2R$ a current $2I$ is flowing, then the ratio of the magnetic fields produced by the two coils is

Q. Magnetic field at the center of a circular coil of radius R and carrying a current i is :