The magnetic field at the centre of a circular coil of radius `r` carrying current `l` is `B_(1)`.
Channel: Doubtnut
Date: 2020-08-30

The magnetic field at the centre of a circular coil of radius `r` carrying current `l` is `B_(1)`. The field at the centre of another coil of radius `2r` carrying same current `l` is `B_(2)`. The ratio `(B_(1))/(B_(2))` is